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sheath    音标拼音: [ʃ'iθ]
n. 鞘,叶鞘,翅鞘

鞘,叶鞘,翅鞘

sheath
外皮; 外层覆盖物

sheath
n 1: a protective covering (as for a knife or sword)
2: an enveloping structure or covering enclosing an animal or
plant organ or part [synonym: {sheath}, {case}]
3: a dress suitable for formal occasions [synonym: {cocktail dress},
{sheath}]

Sheath \Sheath\, n. [OE. schethe, AS. sc[=ae][eth],
sce['a][eth], sc[=e][eth]; akin to OS. sk[=e][eth]ia, D.
scheede, G. scheide, OHG. sceida, Sw. skida, Dan. skede,
Icel. skei[eth]ir, pl., and to E. shed, v.t., originally
meaning, to separate, to part. See {Shed}.]
1. A case for the reception of a sword, hunting knife, or
other long and slender instrument; a scabbard.
[1913 Webster]

The dead knight's sword out of his sheath he drew.
--Spenser.
[1913 Webster]

2. Any sheathlike covering, organ, or part. Specifically:
(a) (Bot.) The base of a leaf when sheathing or investing
a stem or branch, as in grasses.
(b) (Zool.) One of the elytra of an insect.
[1913 Webster]

{Medullary sheath}. (Anat.) See under {Medullary}.

{Primitive sheath}. (Anat.) See {Neurilemma}.

{Sheath knife}, a knife with a fixed blade, carried in a
sheath.

{Sheath of Schwann}. (Anat.) See {Schwann's sheath}.
[1913 Webster]


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