Involucrum

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [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]

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Involucre \In"vo*lu`cre\ (?; 277), n. [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}.
         [1913 Webster]