cockle

n. 1 a edible bivalve shellfish. B its shell. 2 (in full cockle-shell) small shallow boat. 3 pucker or wrinkle in paper, glass, etc.  warm the cockles of one's heart make one contented. [french coquille from greek: related to *conch]

n. A bivalve mollusk, with radiating ribs, of the genus Cardium, especially C. edule, used in Europe for food; -- sometimes applied to similar shells of other genera.