Dictionary

operculum

noun oper·cu·lum \ō-ˈpər-kyə-ləm\
plural oper·cu·la\-lə\ also oper·cu·lums

Definition of OPERCULUM

1
:  a body process or part that suggests a lid: 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 of OPERCULUM

New Latin, from Latin, cover, from operire to shut, cover
First Known Use: 1681

operculum

noun oper·cu·lum \ō-ˈpər-kyə-ləm\   (Medical Dictionary)
plural oper·cu·la \-lə\ also oper·cu·lums

Medical Definition of OPERCULUM

:  any of several parts of the cerebrum bordering the sylvian fissure and concealing the insula

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