A bivalve mollusk of many kinds, especially those that are edible; as, the long clam (Mya arenaria), the quahog or round clam (Venus mercenaria), the sea clam or hen clam (Spisula solidissima), and other species of the United States. The name is said to have been given originally to the Tridacna gigas, a huge East Indian bivalve
The brackish water clam common in Lake Pontchartrain is the Rangia Clam Rangia cuniata, a popular food of the Tchefuncte era Indians Clam shells were discarded by the people in large mounds called middens
Clams are a kind of shellfish which can be eaten. A clamp or vise. clammed clamming clam up to suddenly stop talking, especially when you are nervous or shy. In general, any bivalve mollusk. True clams, in the strict sense, have equal shells, closed by two opposing muscles, and a powerful, muscular, burrowing foot. They usually lie buried in the sand in shallow marine waters. Clams draw in and expel water for respiration and feeding through two tubes, the siphons. Species range in size from 0.004 in. to 4 ft (0.1 mm-1.2 m) across. Many species are edible, including the coquina clam, geoduck, quahog, and soft-shell clam. heart clam coquina clam razor clam