opercular Definition

operculum
noun opercula (plural)

1a. zool.
In some gastropods: a horny plate that covers the opening of the shell;
1b. zool.
In bony fishes: a flap that protects the gills.
2. bot.
A cover or lid.

Derivative: opercular
adj

Derivative: operculate
adj

Having an operculum.

Etymology: 18c: Latin, meaning ‘lid' or ‘covering', from operire to cover.