'Involucra' definitions:

Definition of 'Involucra'

From: GCIDE
  • Involucrum \In`vo*lu"crum\, n.; pl. L. Involucra, E. Involucrums. [L. See Involucre.] [1913 Webster]
  • 1. (Bot.) See Involucre. [1913 Webster]
  • 2. (Zool.) A sheath which surrounds the base of the lasso cells in the Siphonophora. [1913 Webster]