opercules
/ˈoʊpərkjuːlz/
noun
- Plural of opercule; lids or covers that open and close, especially on plants or animals.
- The opercules of different snail species vary in shape and material.
- The biologist collected opercules from several marine shells for her study.
- Under the microscope, the opercules of the mosses looked like tiny trapdoors.
Synonyms