opercle

[oh-per-kuhl]
noun
an operculum, especially the posterior bone of the operculum of a fish.

Origin:
1590–1600; < Latin operculum cover. See operculum, -cle2

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
The opercle was then evaluated as a structure for aging.
Spawning fish generally develop bright red coloration on the underside of the mandible and on the opercle.
The pumpkinseed can be distinguished from the bluegill by the opercle flap on the rear of the operculum.
Coloration generally olive dorsally and silvery, with a conspicuous red streak or smudge posterior of opercle.
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