Definition of sheath
1
: a case for a blade (as of a knife)
2
: an investing cover or case of a plant or animal body or body part: such as
a
: the tubular fold of skin into which the penis of many mammals is retracted
b(1)
: the lower part of a leaf when surrounding the stem
(2)
: an ensheathing spathe
3
: any of various covering or supporting structures that resemble in appearance or function the sheath of a blade: such as
b
: a woman's close-fitting dress that is usually worn without a belt
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Merriam-Webster unabridged
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Time Traveler for sheath
The first known use of sheath was before the 12th century
See more words from the same century