ὄστρεον

Etymology
Traditionally assumed to be related to, though Beekes rejects this connection due to lack of other evidence for an Indo-European pre-form (as well as the word category of seafood being generally unlikely to be of Indo-European origin), and instead takes the word as.

Noun

 * 1) bivalve
 * 2) oyster
 * 3) purple pigment, probably that produced by murex