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Definition of: sheath

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(shēth) noun
1. An envelope or case, as for a sword; scabbard.
2. Bot. A case enclosing a part or an organ, as the lower part of the leaves in grasses.
3. Zool. Any covering in animals that resembles a sheath.
4. Entomol. An elytron of a beetle.
5. Agric. A bar connecting the beam and sole in a plow [OE scǣth]