[soft-shell clam] n (1796): an elongated clam (Mya arenaria) of the east coast of No. America that has a thin friable shell and long siphons and is used esp. for steaming--called also soft-shelled clam, steamer
SOFT-SHELL CLAM
Meaning of SOFT-SHELL CLAM in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012