operculum

noun oper·cu·lum \ ō-ˈpər-kyə-ləm \

Definition of operculum

plural opercula play \ō-ˈpər-kyə-lə\ also operculums
1 : a body process or part that suggests a lid: such as
a : a horny or shelly plate on the posterior dorsal surface of the foot in many gastropod mollusks that closes the shell when the animal is retracted
b : the covering of the gills of a fish — see fish illustration
2 : a lid or covering flap (as of a moss capsule)

Origin and Etymology of operculum

borrowed from New Latin, going back to Latin, "cover, lid," from operīre "to shut, close, cover" (from op-, variant of ob- ob- + pre-Latin *-wer-je- "open or close," as specified by a prefix, going back to Indo-European *Hu̯er-) + -culum, instrumental suffix (going back to Indo-European *-tlom) — more at aperient


Medical Dictionary

operculum

noun oper·cu·lum \ ō-ˈpər-kyə-ləm \

medical Definition of operculum

plural opercula play \-lə\ also operculums
: any of several parts of the cerebrum bordering the sylvian fissure and concealing the insula

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