operculum defined in 1951 yearoperculum - operculum;
operculum - (1) Lid, e.g. of moss capsule, egg shell of fluke. (2) Cover of gill-slits of fish and Amphibia. (3) Exoskeletal plate of some gastropods, e.g. snail, which can close opening of shell when animal withdraws into the latter.
near operculum in Knolik
definition of word "operculum" was readed 1834 times