a cover that fits closely over the blade (= sharp part) of a knife or other sharp weapon or tool （刀、劍等的）鞘；（工具的）套 He put the dagger back in its sheath. 他把短劍插回鞘中。 His sword was still in its sheath. 他的劍還在鞘裏。
any layer that covers and fits closely over something for protection 護套；護層；護皮 the sheath around an electric cable 電線護皮
Extra ExamplesThe wire has an outer sheath of copper. 這根電線有一層銅外殼。 The cable is protected by a strong plastic sheath. 電纜外層有結實的塑料護皮保護着。
- (British English) (also condom British and North American English, North American English or specialist prophylactic)
a thin rubber tube that a man wears over his penis during sex to stop a woman from becoming pregnant or to protect against disease 護套： 男人在性交時戴在陰莖上的一根細橡膠管，可防止婦女懷孕或預防疾病 a woman’s dress that fits the body closely 緊身連衣裙 a simple black silk sheath 簡單的黑色絲綢護套
Word OriginOld English scǣth, scēath ‘scabbard’, of Germanic origin; related to Dutch schede, German Scheide, also to the verb shed.