ἀστακός

A. the smooth lobster, Philyll. 13, Arist. HA 526a11, 549b14, Matro Conv. 66, Archestr. Fr. 24.1; ὁ ἐν τοῖς ποταμοῖς ἀ. the river cray-fish, Arist. HA 530a28.

II. hollow of the ear, Poll. 2.85. (By assimilation from ὀστακός, the Att. form acc. to Ath. 3.105b.)