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operculumOne entry found. Main Entry: oper·cu·lum Pronunciation: \ō-ˈpər-kyə-ləm\ Function: noun Inflected Form(s): plural oper·cu·la \-lə\ also oper·cu·lums Etymology: New Latin, from Latin, cover, from operire to shut, cover Date: 1681 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
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