SHEATH, noun 1. A case for the reception of a sword or other long and slender instrument; a scabbard. A sheath is that which separates, and hence a defense. 2. In botany, a membrane investing a stem or branch, as in grasses. 3. Any thin covering for defense; the wing-case of an insect. SHEATH, verb transitive
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI