steamer clam n 1: a clam that is usually steamed in the shell [syn: {soft- shell clam}, {steamer}, {steamer clam}, {long-neck clam}] 2: an edible clam with thin oval-shaped shell found in coastal regions of the United States and Europe [syn: {soft-shell clam}, {steamer}, {steamer clam}, {long-neck clam}, {Mya arenaria}]