| 释义 |
trigon|ˈtraɪgɒn|
Also 7 trygon, 7–8 trigone.
[ad. L. trigōn-um, ad. Gr. τρίγων-ον triangle, neuter of τρίγωνος, f. τρι- tri- + -γων-ος -angled, -cornered.]
1. A figure having three angles and three sides; a triangle.
1600Fairfax Tasso ii. li, Let Ismen with his squares and trigons war. a1628Sir J. Beaumont Bosworth F. 346 When the Cranes direct their Flight on high,..they in a Trigon fly. 1694Motteux Rabelais iv. Prol. (1737) 78 An equilateral Trigone. 1806Hutton Course Math. I. 272 An Equilateral Triangle is also a Regular Figure of three sides..being also called a Trigon. 1859F. A. Griffiths Artil. Man. (1862) 333 Trigon..Heptagon..Octagon.
2. Astrol.
a. A set of three signs of the zodiac, distant 120° from each other, as if at the angles of an equilateral triangle; = triplicity 3. (Also fig. or allusively.)
b. The aspect of two planets distant 120° from each other; = trine n. 2.
1563[see trient]. 1589Warner Alb. Eng. vi. xxxi. (1612) 158 She Euen at the firie Trigon shall your chiefe Ascendant be. 1593G. Harvey Pierce's Super. 100 His zeale to God, and the Church, was an aery Triplicity: and his deuotion to his Prince, and the State, a fiery Trigon. 1597Shakes. 2 Hen. IV, ii. iv. 288. a 1633 Austin Medit. (1635) 7 If the Astronomers hold there was a great Trigon of Constellations at his [Christ's] Birth: I am sure here is a great Trigon of Trigons, at his Conception. 1644Lilly Eng. Proph. Merlin (title-p.) The beginning, and end of the Watry Trygon: An entrance of the fiery Triplicity. 1664Butler Hud. ii. iii. 905 Some..Affirm the Trigons chopp'd and chang'd, The wat'ry with the fiery rang'd. 1704Hearne Duct. Hist. (1714) I. 23 Saturn and Jupiter..having run through all the four Trigons, meet again, according to Kepler, at the end of 800 Years. 1819J. Wilson Compl. Dict. Astrol. s.v. Triplicity, The first trigon is composed of {aries}, ♌, and {sagit}, and is therefore called the fiery triplicity.
3.
†a. A triangular instrument used in surveying; also, one used in dialling. Obs.
1590J. Blagrave Baculum Familliare (title-p.) A Booke of the making and vse of a Staffe, newly inuented by the Author, called the Familiar Staffe,..which..staffe..readily performeth all the seuerall vses of the Crosse staffe, the Quadrate, the Circle, the Quadrante, the Gunners Quadrante, the Trigon, [etc.]. 1704J. Harris Lex. Techn. I. s.v., In Dyaling there is sometimes used an Instrument of a Triangular Form, which is called, a Trigon.
†b. A triangular fort. Obs.
1688R. Holme Armoury iii. xvi. (Roxb.) 98/1 A Trigon, a figure of a fort with three corners.
c. An ancient lyre or harp of triangular form.
1727–41Chambers Cycl. s.v., The trigon was a kind of triangular lyre, invented by Ibycus. 1776Hawkins Hist. Mus. I. ii. ix. 247 The Trigon..was..struck either with a quill, or beaten with little rods. 1879Stainer Music of Bible 11 Attempts to shew that the kinnor was a trigon, or three-cornered harp.
4. Zool. A bivalve of the genus Trigonia.
1835Kirby Hab. & Inst. Anim. I. viii. 263 The Trigons, nearly related to the cockle, are mostly fossils.
5. Name of an ancient game at ball (Gr. τρίγων, L. trigōn (‘lusum trigonem’, Hor. Sat. i. vi. 126)).
1842W. Smith Dict. Gr. & Rom. Antiq. 761/2 The most favourite game at ball seems to have been the trigon or pila trigonalis,..played at by three persons, who stood in the form of a triangle.
6. Comp. Anat. The triangle formed by the three cusps of the upper molars in primitive mammals.
1897H. F. Osborn in Amer. Nat. Dec. 1002 Our studies among the Mesozoic mammals have left no doubt that the upper and lower triangles, or ‘trigon’ and ‘trigonid’, were derived from the reptilian protocone by the addition of lateral cusps... The ‘trigon’ was essentially a cutting apparatus, so perfect that many mammals retained it without further evolution. |