Definitions

1. adjective

relating to the operculum (a lid or flap on the shell of certain marine animals, especially mussels and oysters)

“The opercular structure of the mussel’s shell is an important adaptation for its survival.”

2. noun

a lid or flap on the shell of certain marine animals

“The opercular cover protects the mussel from predators and debris.”

3. noun

a part of the ear of certain insects, especially beetles, that closes the auditory opening

“The opercular plate on the beetle’s ear helps to block out loud noises.”