noun
limpet
Refers to limpets, especially the species Cellana mazatlandica. A common marine snail with a conical shell found on rocky shores.
磯でカサガイをたくさん見つけた。
I found many limpets on the rocky shore.
カサガイは岩にしっかりくっついている。
Limpets cling tightly to rocks.
The name likely comes from 笠 (かさ, conical hat) + 貝 (かい, shellfish), referring to the shell's shape. The exact derivation is uncertain.