Definition of "opercula" [o•per•cu•la]

• Plural form of operculum. (noun)

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• "These gyri are termed the opercula of the insula; they are separated from each other by the three rami of the lateral fissure, and are named the orbital, frontal, frontoparietal, and temporal opercula."
• "To do this, I need you to hold his opercula, or gill covers, shut so that the air will travel down into his lungs."
• "As though drawn by the slow-motion beckoning, the trout's nose pressed outward, a delicate gasping of mouth and gills, busy in the rhythm of breathing, pink lining showing, not showing, showing, not showing, as the opercula beat like a heart."