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axis
ax·is A0556000 (ăk′sĭs)n. pl. ax·es (ăk′sēz′) 1. A straight line about which a body or geometric object rotates or may be conceived to rotate.2. Mathematics a. An unlimited line, half-line, or line segment serving to orient a space or a geometric object, especially a line about which the object is symmetric.b. A reference line from which distances or angles are measured in a coordinate system.3. A center line to which parts of a structure or body may be referred.4. An imaginary line to which elements of a work of art, such as a picture, are referred for measurement or symmetry.5. Anatomy a. The second cervical vertebra on which the head turns.b. Any of various central structures, such as the spinal column, or standard abstract lines used as a positional referent.6. Botany The main stem or central part about which organs or plant parts such as branches are arranged.7. One of three mutually perpendicular lines that define the orientation of an aircraft, with one being along its direction of travel and the other two being perpendicular to the direction of travel.8. A line through the optical center of a lens that is perpendicular to both its surfaces.9. One of three or four imaginary lines used to define the faces of a crystal and the position of its atoms.10. a. An alliance of powers, such as nations, to promote mutual interests and policies.b. Axis The alliance of Germany and Italy in 1936, later including Japan and other nations, that opposed the Allies in World War II.
[Middle English, from Latin.]axis (ˈæksɪs) n, pl axes (ˈæksiːz) 1. (Mathematics) a real or imaginary line about which a body, such as an aircraft, can rotate or about which an object, form, composition, or geometrical construction is symmetrical2. (Mathematics) one of two or three reference lines used in coordinate geometry to locate a point in a plane or in space3. (Anatomy) anatomy the second cervical vertebra. Compare atlas34. (Botany) botany the main central part of a plant, typically consisting of the stem and root, from which secondary branches and other parts develop5. (Government, Politics & Diplomacy) an alliance between a number of states to coordinate their foreign policy6. (General Physics) optics Also called: principal axis the line of symmetry of an optical system, such as the line passing through the centre of a lens7. (Geological Science) geology an imaginary line along the crest of an anticline or the trough of a syncline8. (General Physics) crystallog one of three lines passing through the centre of a crystal and used to characterize its symmetry[C14: from Latin: axletree, earth's axis; related to Greek axōn axis]
axis (ˈæksɪs) n, pl axises (Animals) any of several S Asian deer of the genus Axis, esp A. axis. They typically have a reddish-brown white-spotted coat and slender antlers[C18: from Latin: Indian wild animal, of uncertain identity]
Axis (ˈæksɪs) n (Historical Terms) a. the Axis the alliance of Nazi Germany, Fascist Italy, and Japan, established in 1936 and lasting until their defeat in World War IIb. (as modifier): the Axis powers. ax•is (ˈæk sɪs)
n., pl. ax•es (ˈæk siz) 1. the line about which a rotating body, such as the earth, turns. 2. a. a central line that bisects a two-dimensional body or figure. b. a line about which a three-dimensional body or figure is symmetrical. c. any line used as a fixed reference for determining the position of a point or series of points, as the x- or y-axis in a system of Cartesian coordinates. 3. Anat. a. a central or principal structure about which something turns or is arranged: the skeletal axis. b. the second cervical vertebra. 4. Bot. a. the main support of a plant; the stem and root. b. the main support of an inflorescence. 5. an imaginary line, in a given formal structure, about which a form, area, or plane is organized. 6. the Axis, (in World War II) the nations that fought against the Allies: Germany, Italy, Japan, and others. 7. an alliance of two or more nations to coordinate their foreign and military policies. 8. a principal line of development, movement, etc. [1540–50; < Latin axis an axletree, axle, axis; Greek áxōn, Sktákṣas] ax·is (ăk′sĭs) Plural axes (ăk′sēz′) 1. An imaginary line around which an object rotates. In a rotating sphere, such as the Earth and other planets, the two ends of the axis are called poles.2. Mathematics a. A line, ray, or line segment with respect to which a figure or object is symmetrical.b. In the Cartesian coordinate system, one of the reference lines from which or along which distances or angles are measured: the x-axis.3. Anatomy The second cervical vertebra on which the head turns.4. Botany The main stem or central part of a plant, about which plant parts, such as branches, are arranged.
axial adjectiveaxisIn land warfare, the general direction of movement, planned or achieved, usually between assigned boundaries.Axis the association of the countries that formed the German/Italian/Japanese alliance in World War II.axisA national alliance to co-ordinate foreign policy, specifically the pact between Hitler and Mussolini in 1937.Thesaurus| Noun | 1. |  axis - a straight line through a body or figure that satisfies certain conditionscoordinate axis - one of the fixed reference lines of a coordinate systemmajor axis - the longest axis of an ellipse or ellipsoid; passes through the two focisemimajor axis - one-half the major axis of an ellipse; the distance from the center of an ellipse to one endminor axis - the shorter or shortest axis of an ellipse or ellipsoidsemiminor axis - one-half the minor axis of an ellipseprincipal axis, optic axis - a line that passes through the center of curvature of a lens so that light is neither reflected nor refracted; "in a normal eye the optic axis is the direction in which objects are seen most distinctly"optic axis - in a doubly refracting crystal, the line in the direction of which no double refraction occurs; "a crystal may have either one or two optic axes"line - a spatial location defined by a real or imaginary unidimensional extent | | 2. |  axis - the main stem or central part about which plant organs or plant parts such as branches are arrangedstele - the usually cylindrical central vascular portion of the axis of a vascular plantrachis - axis of a compound leaf or compound inflorescencestalk, stem - a slender or elongated structure that supports a plant or fungus or a plant part or plant organspadix - the fleshy axis of a spike often surrounded by a spathe | | 3. |  Axis - in World War II the alliance of Germany and Italy in 1936 which later included Japan and other nations; "the Axis opposed the Allies in World War II"alignment, alinement, coalition, alliance - an organization of people (or countries) involved in a pact or treaty | | 4. |  axis - a group of countries in special allianceblocalignment, alinement, coalition, alliance - an organization of people (or countries) involved in a pact or treatyscheduled territories, sterling area, sterling bloc - the group of countries whose currencies are tied to the British pound sterling | | 5. |  axis - the 2nd cervical vertebra; serves as a pivot for turning the headaxis vertebracervical vertebra, neck bone - one of 7 vertebrae in the human spine located in the neck regionodontoid process - a toothlike process at the back of 2nd vertebra of the neck | | 6. |  axis - the center around which something rotatesaxis of rotationmechanism - device consisting of a piece of machinery; has moving parts that perform some functionpivot, pin - axis consisting of a short shaft that supports something that turnsrotor head, rotor shaft - the axis around which the major rotor of a helicopter turns |
axisnoun pivot, shaft, axle, spindle, centre line the axis of the EarthTranslationsaxis (ˈӕksis) – plural axes (ˈӕksiːz) – noun1. the real or imaginary line on which a thing turns (as the axis of the earth, from North Pole to South Pole, around which the earth turns). 軸線 轴线2. a fixed line used as a reference, as in a graph. He plotted the temperatures on the horizontal axis. 圖軸 轴axis
Axis, coalition of countries headed by Germany, Italy, and Japan, 1936–45 (see World War IIWorld War II,
1939–45, worldwide conflict involving every major power in the world. The two sides were generally known as the Allies and the Axis. Causes and Outbreak
..... Click the link for more information. ). The expression "Rome-Berlin axis" originated in Oct., 1936, with an accord reached by HitlerHitler, Adolf
, 1889–1945, founder and leader of National Socialism (Nazism), and German dictator, b. Braunau in Upper Austria. Early Life
The son of Alois Hitler (1837–1903), an Austrian customs official, Adolf Hitler dropped out of high school, and
..... Click the link for more information. and MussoliniMussolini, Benito
, 1883–1945, Italian dictator and leader of the Fascist movement. Early Career
His father, an ardent Socialist, was a blacksmith; his mother was a teacher.
..... Click the link for more information. . The Axis was solidified by an Italo-German alliance in May, 1939. This was extended (Sept., 1940) by a military alliance among Germany, Italy, and Japan—the so-called Berlin Pact, to which Hungary, Romania, Bulgaria, Slovakia, and Croatia adhered later. The related Anti-Comintern Pact (see CominternComintern
[acronym for Communist International], name given to the Third International, founded at Moscow in 1919. Vladimir Ilyich Lenin feared a resurgence of the Second, or Socialist, International under non-Communist leadership.
..... Click the link for more information. ), originally concluded between Germany and Japan in 1936, later had as adherents, besides the Berlin Pact nations, Spain, Denmark, Finland, and the puppet governments of Manchukuo and Nanjing.axis 1. An imaginary line that usually passes through the center of a body or system and about which the body is often symmetrical or has some form of symmetry. It is the imaginary line about which a rotating body turns or about which an object, such as the celestial sphere, appears to rotate. 2. A reference line on a graph.AxisAn imaginary straight line, about which parts of a building, or group of buildings, can be arranged or measured.axis[′ak·səs] (anatomy) The second cervical vertebra in higher vertebrates; the first vertebra of amphibians. The center line of an organism, organ, or other body part. (geology) A line where a folded bed has maximum curvature. The central portion of a mountain chain. (graphic arts) The locus of intersection of two pencils of lines in perspective position. (mathematics) In a coordinate system, the line determining one of the coordinates, obtained by setting all other coordinates to zero. A line of symmetry for a geometric figure. For a cone whose base has a center, a line passing through this center and the vertex of the cone. (mechanics) A line about which a body rotates. axisA straight line indicating center of symmetry of a solid or plane figure.Axisin World War II, the affiance of Germany, Italy, Japan, etc., opposing the Allies. [Eur. Hist.: Collier’s, VIII, 457]See: Cooperationaxis11. a real or imaginary line about which a body, such as an aircraft, can rotate or about which an object, form, composition, or geometrical construction is symmetrical 2. one of two or three reference lines used in coordinate geometry to locate a point in a plane or in space 3. Anatomy the second cervical vertebra 4. Botany the main central part of a plant, typically consisting of the stem and root, from which secondary branches and other parts develop 5. an alliance between a number of states to coordinate their foreign policy 6. Optics the line of symmetry of an optical system, such as the line passing through the centre of a lens 7. Geology an imaginary line along the crest of an anticline or the trough of a syncline 8. Crystallog one of three lines passing through the centre of a crystal and used to characterize its symmetry
axis2 any of several S Asian deer of the genus Axis, esp A. axis. They typically have a reddish-brown white-spotted coat and slender antlers axis
axis [ak´sis] (pl. ax´es) 1. a line through a center of a body, or about which a structure revolves.the second cervical vertebra. adj., adj ax´ial.2. the position of the cylindrical part of a lens, used for correcting astigmatism; the range of values is from 0° to 180°.celiac axis celiac trunk.dorsoventral axis one passing from the posterior to the anterior surface of the body.electrical axis of heart the preponderant direction of current flow through the heart, a consequence of the electromotive forces within the heart. It may be computed on either an instantaneous basis or a mean basis.frontal axis an imaginary line running from right to left through the center of the eyeball.axis of heart a line passing through the center of the base of the heart to the apex.instantaneous electrical axis the electrical axis of the heart determined at a given point in time.lead axis the imaginary direct line between the two electrodes of the bipolar leads or between the positive electrode and the reference point of the unipolar leads.mean electrical axis the average direction of the activation or repolarization process during the cardiac cycle; it may be determined for any deflection (P, QRS, ST-T) and in the frontal, transverse, or sagittal plane.optic axis 1. a line connecting the center of the anterior curvature of the cornea (anterior pole) with that of the posterior curvature of the sclera (posterior pole).2. the hypothetical straight line passing through the centers of curvature of the front and back surfaces of a simple lens.phlebostatic axis a point located by drawing an imaginary line from the fourth intercostal space at the sternum and finding its intersection with an imaginary line drawn down the center of the chest below the axillae.  Phlebostatic axis.sagittal axis an imaginary line extending through the anterior and posterior poles of the eye.visual axis an imaginary line passing from the midpoint of the visual field to the fovea centralis. Axes of the eye. From Dorland's , 2000. ax·is (ax), , pl. ax·es (ak'sis, ak'sēz), Do not confuse this word with access.1. A straight line joining two opposing poles of a spheric body, about which the body may revolve. 2. The central line of the body or any of its parts. 3. The second cervical vertebra. 4. The vertebral column. Synonym(s): vertebra C2 ☆ , epistropheus, odontoid vertebra, second cervical vertebra, toothed vertebra, vertebra dentata5. The central nervous system. 6. An artery that divides, immediately on its origin, into a number of branches, for example, celiac axis. [L. axle, axis] axis (ăk′sĭs)n. pl. axes (ăk′sēz′) 1. A straight line about which a body or geometric object rotates or may be conceived to rotate.2. A center line to which parts of a structure or body may be referred.3. Anatomy a. The second cervical vertebra on which the head turns.b. Any of various central structures, such as the spinal column, or standard abstract lines used as a positional referent.axis Anatomy
The second bone of the vertebrae (C2), which contains a distinct bony protuberance, the odontoid process (dens), on which the first cervical vertebra (C1, the atlas), which carries the head, rotates.
Significance, execution
During judicial hangings, the odontoid process typically breaks off and is forced into the medulla oblongata, which contains the cardiac, respiratory and vasomotor centres that control involuntary functions (e.g., breathing, heart rate and blood pressure), usually resulting in instant death.
Medpspeak
(1) A central or straight line between two structures.
(2) A functional centre between two or more physiologically related activities—e.g., brain-gut axis, hypothalamic-pituitary-adrenal axis.axis Medtalk A central or straight line between two structures. See Brain-gut axis, Hypothalamic-pituitary-adrenal axis. ax·is, pl. axes (ak'sis, ak'sēz) 1. A straight line joining two opposing poles of a spheric body, about which the body may revolve. 2. The central line of the body or any of its parts. 3. The vertebral column. 4. The central nervous system. 5. The second cervical vertebra.
Synonym(s): epistropheus, vertebra C2, vertebra dentata. 6. An artery that divides, immediately on its origin, into a number of branches, e.g., celiac axis.
See: trunkaxis 1. The second of the vertebrae of the spine, upon which the skull and first vertebra (ATLAS) can rotate. The axis bone has a short, stout vertical peg called the odontoid process around which the atlas can rotate. 2. An imaginary central line of a part or of the body. 3. The meridian in a CYLINDRICAL LENS that possesses no optical power. The curve of maximal power is at right angles to the axis. AxisA line that passes through the center of the body or body part.Mentioned in: Fracturesaxis A real or imaginary straight line about which a body or system can rotate, or about which a body or system is symmetrical.
achromatic axis A line in the eye along which light passes through all the optical elements and emerges without chromatic dispersion. Although it may lie close to the optical axis it does not necessarily coincide with it. See chromostereopsis; dispersion; chromatic parallax.
anteroposterior axis A line passing through the anterior and posterior poles and the centre of rotation of the eye. It is perpendicular to the transverse (or x-axis) and the vertical (or z-axis). Torsional movements occur around this axis. Syn. sagittal axis; y-axis. See centre of rotation of the eye; poles of the eyeball; torsion.
cylinder axis 1. A line of zero curvature on a cylindrical surface. 2. That principal meridian of a planocylinder in which the power is zero. See astigmatic lens.
axis's of Fick Three mutually perpendicular axes which intersect at the centre of rotation of the eye. They are the x-, y-, and z-axes. Syn. primary axes of Fick. See vertical transverse anteroposterior axis; sagittal plane; xy listing's; yz plane.
fixation axis The line joining the object of regard to the centre of rotation of the eye. Syn. line of fixation.
geometrical axis The line passing through the anterior and posterior poles of the eye. If the refractive surfaces are symmetrical about that axis, it will then coincide with the optical axis.
horizontal axis See transverse axis.
axis notation See standard axis notation.
axis notation, standard The accepted axis notation for cylinders, the same for each eye, whereby the specified axis direction denotes the angle of the cylinder axis with the horizontal measured anticlockwise from 0º to 180º, the front surface of the lens being viewed (British Standard). (Fig. A23) Syn. TABO notation (although the TABO notation specifies the axis direction from 0º to 360º); OCA notation.
optical axis 1. The line joining the optical centres of the refractive surfaces of the eye (a theoretical concept in the eye). A close approximation of this axis is represented by aligning the Purkinje images of a test object (Fig. P14, page 284). 2. The line normal to the surfaces of a lens along which light passes undeviated. See Purkinje-Sanson images.
orbital axis The line from the middle of the orbital opening to the centre of the optic canal. The orbital axes of a normal adult make an angle of approximately 45º with each other. See orbit.
principal axis A line passing through the centre of curvature of a surface and through its vertex.
pupillary axis The line passing through the centre of the entrance pupil of the eye and the pole of the cornea. Syn. pupillary line. See poles of the eyeball.
sagittal axis See anteroposterior axis.
transverse axis A horizontal line passing through the centre of rotation of the eye and lying in Listing's plane. Syn. x-axis. See anteroposterior axis; Listing's plane.
vertical axis A vertical line passing through the centre of rotation of the eye. Syn. z-axis.
visual axis The line joining the object of regard to the foveola and passing through the nodal points which are often considered as coincident, as they are very close to each other. Strictly, this axis is not a single straight line as it consists of two parts: one line connecting the object of regard to the first nodal point and the other line parallel and connecting the second nodal point to the foveola. Syn. visual line. See line of sight.
x-axis See transverse axis.
y-axis See anteroposterior axis.
z-axis See vertical axis. " > Fig. A23 Illustration of the standard cylinder axis notationax·is, pl. axes (ak'sis, ak'sēz) 1. [TA] Straight line joining two opposing poles of a spheric body, about which the body may revolve. 2. Central line of the body or any of its parts. 3. [TA] Second cervical vertebra. 4. Vertebral column. 5. Central nervous system. 6. Artery that divides, immediately on its origin, into a number of branches, e.g., celiac axis. LegalSeedeviationAxis
AxisIn Cartesian charting, a line that bisects a chart. The x-axis cuts a chart horizontally, while the y-axis cuts it vertically.AXIS
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See AXaxis
Synonyms for axisnoun pivotSynonyms- pivot
- shaft
- axle
- spindle
- centre line
Words related to axisnoun a straight line through a body or figure that satisfies certain conditionsRelated Words- coordinate axis
- major axis
- semimajor axis
- minor axis
- semiminor axis
- principal axis
- optic axis
- line
noun the main stem or central part about which plant organs or plant parts such as branches are arrangedRelated Words- stele
- rachis
- stalk
- stem
- spadix
noun in World War II the alliance of Germany and Italy in 1936 which later included Japan and other nationsRelated Words- alignment
- alinement
- coalition
- alliance
noun a group of countries in special allianceSynonymsRelated Words- alignment
- alinement
- coalition
- alliance
- scheduled territories
- sterling area
- sterling bloc
noun the 2nd cervical vertebraSynonymsRelated Words- cervical vertebra
- neck bone
- odontoid process
noun the center around which something rotatesSynonymsRelated Words- mechanism
- pivot
- pin
- rotor head
- rotor shaft
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