OPERCLE
\ˈɒpəkə͡l], \ˈɒpəkəl], \ˈɒ_p_ə_k_əl]\
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Any one of the bony plates which support the gill covers of fishes; an opercular bone.
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An operculum.
By Oddity Software
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Any one of the bony plates which support the gill covers of fishes; an opercular bone.
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An operculum.
By Noah Webster.
By Henderson, I. F.; Henderson, W. D.