Quick definitions from WordNet (soft-shell clam)
▸ noun: an edible clam with thin oval-shaped shell found in coastal regions of the United States and Europe
▸ noun: a clam that is usually steamed in the shell
▸ noun: an edible clam with thin oval-shaped shell found in coastal regions of the United States and Europe
▸ noun: a clam that is usually steamed in the shell