The Collaborative International Dictionary
Involucra
Involucrum \In`vo*lu"crum\, n.; pl. L. Involucra, E. Involucrums. [L. See Involucre.]
(Bot.) See Involucre.
(Zo["o]l.) A sheath which surrounds the base of the lasso cells in the Siphonophora.
Wiktionary
involucra
n. (plural of involucrum English)
WordNet
involucra
See involucre
involucra
See involucrum
involucre
n. a highly conspicuous bract or bract pair or ring of bracts at the base of an inflorescence
[also: involucra (pl)]