- an operculum, especially the posterior bone of the operculum of a fish.
Origin of opercle
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for opercle
In Erpetoichthys only the opercle is distinct among the gill-covers.
The tip of its opercle is prolonged like an ear and jet black in color, with a dash of bright scarlet along its lower edge.
Overlying these is the system of membrane bones already mentioned, including the opercle or gill-cover.
On our sunfish we see that the opercle ends behind in a long and narrow flap, which looks like an ear.
The largest uppermost flat bone of the gill-covers is known as the opercle .