| 单词 | sheath |
| 释义 | sheath —sheathless, adj. —sheathlike, sheathy, adj. /sheeth/, n. , pl. sheaths /sheedhz/, v. n. 1. a case or covering for the blade of a sword, dagger, or the like. 2. any similar close-fitting covering or case. 3. a condom. 4. Biol. a closely enveloping part or structure, as in an animal or plant. 5. Bot. the leaf base when it forms a vertical coating surrounding the stem. 6. a close-fitting dress, skirt, or coat, esp. an unbelted dress with a straight drape. 7. Elect. the metal covering of a cable. 8. Electronics. a. the metal wall of a wave guide. b. a space charge formed by ions near an electrode in a tube containing low-pressure gas. c. the region of a space charge in a cathode-ray tube. v.t. 9. to sheathe. [bef. 950; ME s(c)heth(e), OE sceath; c. G Scheide; see SHED2] |
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