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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 the Appendix of Indo-European roots.]  (click for a larger image) sheathPersian sheath (left) and dagger (right) |
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