Dictionary entry

Involucrum

Webster's Dictionary 1913

‖In′vo‐lu″crum (?), n.; pl. L. Involucra (#), E. Involucrums (#). [L. See Involucre.]

1. (Bot.) See Involucre.

2. (Zoöl.) A sheath which surrounds the base of the lasso cells in the Siphonophora.