Hām'mer-oys'ter, n.
(Zoöl.) A bivalve shell (Malleus vulgaris), found in the East Indies, allied to the pearl oyster, and resembling it when young, but when mature becoming hammer-shaped.
(Zoöl.) A bivalve shell (Malleus vulgaris), found in the East Indies, allied to the pearl oyster, and resembling it when young, but when mature becoming hammer-shaped.