Operculum

noun oper·cu·lum \ō-ˈpər-kyə-ləm\

Definition of operculum

plural

opercula

play\ō-ˈpər-kyə-lə\ also

operculums

  1. 1:  a body process or part that suggests a lid: such asa :  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 retractedb :  the covering of the gills of a fish — see fish illustration

  2. 2:  a lid or covering flap (as of a moss capsule)

    Definition by Merriam-Webster

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