ˈɔɪ.stə(ɹ) ˈɔɪ.stɚ ˈɔɪ.stə(ɹ) ˈɔɪ.stɚ gather oysters, dig oysters marine mollusks having a rough irregular shell; found on the sea bed mostly in coastal waters a small muscle on each side of the back of a fowl edible body of any of numerous oysters