| 释义 |
sheath
sheath S0326200 (shēth)n. pl. sheaths (shēthz, shēths) 1. a. A usually close-fitting case or covering for a blade, as of a sword.b. Any of various similar coverings.2. Biology An enveloping tubular structure, such as the base of a grass leaf that surrounds the stem or the tissue that encloses a muscle or nerve fiber.3. A close-fitting dress.4. A condom.
[Middle English schethe, from Old English scēath; see skei- in Indo-European roots.]sheath (ʃiːθ) n, pl sheaths (ʃiːðz) 1. a case or covering for the blade of a knife, sword, etc2. any similar close-fitting case3. (Biology) biology an enclosing or protective structure, such as a leaf base encasing the stem of a plant4. (Electronics) the protective covering on an electric cable5. (Clothing & Fashion) a figure-hugging dress with a narrow tapering skirt6. another name for condomvb (tr) another word for sheathe[Old English scēath; related to Old Norse skeithir, Old High German sceida a dividing; compare Old English scādan to divide]sheath (ʃiθ)
n., pl. sheaths (ʃiðz) 1. a case or close-fitting covering, esp. one for the blade of a sword, dagger, or the like. 2. a closely enveloping part or structure in an animal or plant. 3. a close-fitting dress, skirt, or coat, esp. a straight unbelted dress. 4. a condom. [before 950; Old English scēath, c. Old High German sceida, Old Norse skeithir (pl.)] sheath - Seems to have first been a split stick that a sword could be inserted into.See also related terms for sword.sheath
Past participle: sheathed
Gerund: sheathing
| Present |
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| I sheath | | you sheath | | he/she/it sheaths | | we sheath | | you sheath | | they sheath |
| Preterite |
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| I sheathed | | you sheathed | | he/she/it sheathed | | we sheathed | | you sheathed | | they sheathed |
| Present Continuous |
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| I am sheathing | | you are sheathing | | he/she/it is sheathing | | we are sheathing | | you are sheathing | | they are sheathing |
| Present Perfect |
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| I have sheathed | | you have sheathed | | he/she/it has sheathed | | we have sheathed | | you have sheathed | | they have sheathed |
| Past Continuous |
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| I was sheathing | | you were sheathing | | he/she/it was sheathing | | we were sheathing | | you were sheathing | | they were sheathing |
| Past Perfect |
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| I had sheathed | | you had sheathed | | he/she/it had sheathed | | we had sheathed | | you had sheathed | | they had sheathed |
| Future |
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| I will sheath | | you will sheath | | he/she/it will sheath | | we will sheath | | you will sheath | | they will sheath |
| Future Perfect |
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| I will have sheathed | | you will have sheathed | | he/she/it will have sheathed | | we will have sheathed | | you will have sheathed | | they will have sheathed |
| Future Continuous |
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| I will be sheathing | | you will be sheathing | | he/she/it will be sheathing | | we will be sheathing | | you will be sheathing | | they will be sheathing |
| Present Perfect Continuous |
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| I have been sheathing | | you have been sheathing | | he/she/it has been sheathing | | we have been sheathing | | you have been sheathing | | they have been sheathing |
| Future Perfect Continuous |
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| I will have been sheathing | | you will have been sheathing | | he/she/it will have been sheathing | | we will have been sheathing | | you will have been sheathing | | they will have been sheathing |
| Past Perfect Continuous |
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| I had been sheathing | | you had been sheathing | | he/she/it had been sheathing | | we had been sheathing | | you had been sheathing | | they had been sheathing |
| Conditional |
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| I would sheath | | you would sheath | | he/she/it would sheath | | we would sheath | | you would sheath | | they would sheath |
| Past Conditional |
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| I would have sheathed | | you would have sheathed | | he/she/it would have sheathed | | we would have sheathed | | you would have sheathed | | they would have sheathed |
Thesaurus| Noun | 1. |  sheath - a protective covering (as for a knife or sword)aglet, aiglet - metal or plastic sheath over the end of a shoelace or ribboncot, fingerstall - a sheath worn to protect a fingerholster - a sheath (usually leather) for carrying a handgunprotective cover, protective covering, protection - a covering that is intend to protect from damage or injury; "they had no protection from the fallout"; "wax provided protection for the floors"scabbard - a sheath for a sword or dagger or bayonet | | 2. | sheath - an enveloping structure or covering enclosing an animal or plant organ or partcasetheca - outer sheath of the pupa of certain insectslorica - a hard protective sheath (as secreted by certain protoctists, for example)medullary sheath, myelin sheath - a layer of myelin encasing (and insulating) the axons of medullated nerve fibersneurilemma, neurolemma - thin membranous sheath around a nerve fibercovering, natural covering, cover - a natural object that covers or envelops; "under a covering of dust"; "the fox was flushed from its cover"husk - outer membranous covering of some fruits or seeds | | 3. |  sheath - a dress suitable for formal occasionscocktail dressdress, frock - a one-piece garment for a woman; has skirt and bodice |
sheathnoun1. scabbard, case She drew a combat knife from its sheath.2. condom, rubber (U.S. informal), contraceptive, Durex (Brit. trademark), johnny (Brit. informal), prophylactic (U.S.), French letter (Brit. archaic) A rubber sheath placed over the erect penis stops sperm entering the vagina.3. covering, casing, case, cover, sleeve It grows on a nerve sheath within the spinal column.sheathnounA thin outer covering of an object:lamina, membrane, sheathing, skin.Translationssheath (ʃiːθ) – plural sheaths (ʃiːθs ʃiːðz) – noun1. a case for a sword or blade. 刀鞘，劍鞘 （刀、剑或工具尖锐部分的）鞘、套 2. a long close-fitting covering. The rocket is encased in a metal sheath. 套，殼 套，壳 sheathe (ʃiːð) verb to put into a sheath. He sheathed his sword. 入鞘 入鞘sheath
sheath1. Biology an enclosing or protective structure, such as a leaf base encasing the stem of a plant 2. the protective covering on an electric cable sheath[shēth] (electricity) A protective outside covering on a cable. (electronics) A space charge formed by ions near an electrode in a gas tube. (electromagnetism) The metal wall of a waveguide. (science and technology) A protective case or cover. sheathIn reinforced concrete, an enclosure which encases posttensioned tendons to prevent their being bonded during the placement of concrete.sheath
sheath [shēth] a tubular case or envelope.arachnoid sheath the delicate membrane between the pial sheath and the dural sheath of the optic nerve.carotid sheath a portion of the cervical fascia enclosing the carotid artery, internal jugular vein, vagus nerve, and sympathetic nerves supplying the head.connective tissue sheath of Key and Retzius endoneurium.crural sheath femoral sheath.dural sheath the external investment of the optic nerve.femoral sheath the fascial sheath of the femoral vessels.Henle's sheath endoneurium.lamellar sheath the perineurium.medullary sheath myelin sheath.myelin sheath (nerve sheath) the sheath surrounding the axon of myelinated nerve cells, consisting of concentric layers of myelin formed in the peripheral nervous system by the plasma membrane of Schwann cells, and in the central nervous system by the plasma membrane of oligodendrocytes. It is interrupted at intervals along the length of the axon by gaps known as nodes of Ranvier. Myelin is an electrical insulator that serves to speed the conduction of nerve impulses (see conduction" >saltatory conduction).pial sheath the innermost of the three sheaths of the optic nerve.root sheath the epidermic layer of a hair follicle.sheath of Schwann neurilemma.synovial sheath synovial membrane lining the cavity of a bone through which a tendon moves.tendon sheath a lubricated fibrous or synovial layer of tissue in which the tendon is housed and through which it moves.sheath (shēth), 1. Any enveloping structure, such as the membranous covering of a muscle, nerve, or blood vessel. Any sheathlike structure. Synonym(s): vagina (1) 2. The prepuce of male animals, especially of the horse. 3. A specially designed tubular instrument through which special obturators or cutting instruments can be passed, or through which blood clots, tissue fragments, and calculi can be evacuated. 4. A tube used as an orthodontic appliance, usually on molars. [A.S. scaeth] sheath (shēth)n. pl. sheaths (shēthz, shēths) An enveloping tubular structure, such as the tissue that encloses a muscle or nerve fiber.sheath (shēth) 1. Any enveloping structure, such as the membranous covering of a muscle, nerve, or blood vessel; any sheathlike structure.
Synonym(s): vagina (1) . 2. The prepuce of male animals, especially of the horse. 3. A specially designed tubular instrument through which special obturators or cutting instruments can be passed, or through which blood clots, tissue fragments, or calculi can be evacuated. 4. A tube used as an orthodontic appliance, usually on molars. [A.S. scaeth]sheathS07-856140 (sheth) 1. A covering structure of connective tissue, usually of an elongated part, such as the membrane covering a muscle.2. An instrument introduced into a vessel during angiographic procedures when multiple catheter changes are anticipated. It facilitates ease of change and decreases morbidity at the puncture site. Patient careThe sheath introduced into the femoral artery, the preferred vascular access route for percutaneous coronary intervention, is a 4 to 6 French (1.35 to 2 mm) in size. The sheath remains in place after completion of the procedure and removal of the catheter until anticoagulation is reversed or anticoagulants are below peak action. The sheath is connected to high-pressure tubing and a flushing system; manual or automatic flushing keeps the line patent. A stopcock connected to the system permits drawing of blood samples. axon sheathA myelin sheath or a neurilemma. See: myelin sheathcarotid sheathThe portion of cervical or pretracheal fascia enclosing the carotid artery, interior jugular vein, and vagus nerve.crural sheathThe fascial covering of femoral vessels.dural sheathA fibrous membrane or external investment of the optic nerve.femoral sheathThe fascia covering the femoral vessels.sheath of Henle See: Henle sheathsheath of Hertwig See: Hertwig's root sheathsheath of Key and RetziusEndoneurium.lamellar sheathA connective tissue sheath covering a bundle of nerve fibers. Synonym: nerve sheath; perineuriummedullary sheathAn obsolete term for myelin sheath. MYELIN SHEATHmyelin sheathLayers of the cell membrane of Schwann cells (peripheral nervous system) or oligodendrocytes (central nervous system) that wrap nerve fibers, providing electrical insulation and increasing the velocity of impulse transmission. Synonym: Schwann sheath See: nerve fiber; neuron; illustrationnerve sheathLamellar sheath.periarterial lymphoid sheathThe tissue composed of T lymphocytes that surrounds each arteriole in the spleen. The sheaths are attached to lymphoid follicles containing B cells and make up much of the white pulp. See: spleenpial sheathAn extension of the pia that closely invests the surface of the optic nerve.sheath of Schweigger-SeidelThe thickened wall of a sheathed artery of the spleen.rectus sheathA strong fibrous sleeve in which the rectus abdominis and pyramidalis muscles contract. The sheath is formed from the aponeuroses of the abdominal wall muscles as they meet in the linea alba at the abdominal midline. root sheath1. One of the layers of a hair follicle derived from the epidermis. It includes the outer root sheath, which is a continuation of the stratum germinativum, and the inner root sheath, which consists of three layers of cells that closely invest the root of the hair. See: hair2. The epithelial covering that induces root formation in teeth. Also called Hertwig's root sheath.synovial sheathSynovial tendon sheath.tendon sheathA dense fibrous sheath that confines a tendon to an osseous groove, converting it into an osteofibrous canal. It is found principally in the wrist and ankle. See: synovial sheathsheath 1. An enveloping structure or part, usually tubular. 2. A condom. sheath (shēth) 1. Tube used as an orthodontic appliance, usually on molars. 2. Any enveloping structure, such as membranous covering of a muscle, nerve, or blood vessel. 3. Specially designed tubular instrument through which special obturators or cutting instruments can be passed, or through which blood clots, tissue fragments, and calculi can be evacuated. [A.S. scaeth]sheath
Related to sheath: cable sheath, carotid sheathSynonyms for sheathnoun scabbardSynonymsnoun condomSynonyms- condom
- rubber
- contraceptive
- Durex
- johnny
- prophylactic
- French letter
noun coveringSynonyms- covering
- casing
- case
- cover
- sleeve
Synonyms for sheathnoun a thin outer covering of an objectSynonyms- lamina
- membrane
- sheathing
- skin
Synonyms for sheathnoun a protective covering (as for a knife or sword)Related Words- aglet
- aiglet
- cot
- fingerstall
- holster
- protective cover
- protective covering
- protection
- scabbard
noun an enveloping structure or covering enclosing an animal or plant organ or partSynonymsRelated Words- theca
- lorica
- medullary sheath
- myelin sheath
- neurilemma
- neurolemma
- covering
- natural covering
- cover
- husk
noun a dress suitable for formal occasionsSynonymsRelated Words |