noun
univalve; single-shelled mollusk
Refers to mollusks with a single shell, such as snails and limpets, as opposed to bivalves (二枚貝). Used in biological and everyday contexts.
サザエは一枚貝の仲間です。
Turban shells are a type of univalve.
一枚貝と二枚貝の違いを調
I look up the difference between univalves and bivalves.