Longman Dictionary of Contemporary English homepage

Language: Old English
Origin: sceath

sheath

 noun
     
Related topics: Biology
sheath plural sheaths [countable]
1 a cover for the blade of a knife or sword:
His sword was back in its sheath.
2 British English old-fashioned a condom
3HB a protective covering that fits closely around something:
The wire is covered by an outer plastic sheath.
4 a simple, close-fitting dress:
She was wearing a plain black sheath.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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