noun
spiny oyster; Saccostrea kegaki
A species of small, spiny oyster. The name is usually written in katakana as ケガキ.
ケガキは潮間帯の岩に付着している小さな二枚貝です。
The kegaki is a small bivalve that attaches to rocks in the intertidal zone.
The name ケガキ likely derives from 毛 (ke, 'hair') and 牡蠣 (kaki, 'oyster'), referring to the spiny, hair-like projections on the shell. The exact derivation is uncertain.