Operculum /(?)/

O·per·cu·lum

Operculum

n.

pl. Opercula, Operculums

  1. The lid of a pitcherform leaf. (Bot.)
  2. Any lidlike or operculiform process or part; as, the opercula of a dental follicle. (Anat.)
  3. The lid closing the aperture of various species of shells, as the common whelk. See Illust. of Gastropoda. (Zool.)