operculum meaning in Hindi

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The posterior extremity is caducous, and destitute of an operculum.
The operculum serves some of the same functions as an epiphragm.
The entire operculum is paucispiral, and has an eccentric nucleus.
The operculum is circular, multispiral, with a central nucleus.
The operculum is yellowish, ovate and has an apical nucleus.
The interior of the operculum is ovate, withan apical nucleus.
The operculum is castaneous within, with four rapidly increasing whorls.
Gills are tissues which consist of threadlike protein structures called operculum.
The operculum and preopercle may or may not have spines.
The adult animal has a very large, solid and heavy operculum.

noun.

a hard flap serving as a cover for (a) the gill slits in fishes or (b) the opening of the shell in certain gastropods when the body is retracted