From The Collaborative International Dictionary of English v.0.44 [gcide]:
Involucre \In"vo*lu'cre\ (?; 277), noun [L. involucrum a covering, wrapper, fr. involvere to wrap up, envelop: cf. F. involucre. See {Involve}.] (Bot.) (a) A whorl or set of bracts around a flower, umbel, or head. (b) A continuous marginal covering of sporangia, in certain ferns, as in the common brake, or the cup-shaped processes of the filmy ferns. (c) The peridium or volva of certain fungi. Called also {involucrum}.
From The Collaborative International Dictionary of English v.0.44 [gcide]:
Involucrum \In'vo*lu"crum\, noun; pl. L. {Involucra}, E. {Involucrums}. [L. See {Involucre}.]
2. (Zo["o]l.) A sheath which surrounds the base of the lasso cells in the {Siphonophora}.
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