Hypertext Webster Gateway: "Involucrums"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Involucrum \In`vo*lu"crum\, n.; pl. L. {Involucra}, E.
{Involucrums}. [L. See {Involucre}.]
1. (Bot.) See {Involucre}.
2. (Zo["o]l.) A sheath which surrounds the base of the lasso
cells in the Siphonophora.
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