Category:Involucrum

In`vo*lu"crum, n.; pl. L. Involucra, E. Involucrums. Etym: [L. See Involucre.]

1. (Bot.)

Defn: See Involucre.

2. (Zoöl.)

Defn: A sheath which surrounds the base of the lasso cells in the Siphonophora.