- A mollusc
- A small mollusc
- Edible bivalve
- Edible shellfish
- Surf clam
- Any marine bivalve shell of the genus Mactra, and allied
genera. Many species are known. Some of them are used as food, as
Mactra stultorum, of Europe. See Surf clam, under Surf.
- Any one of the large bivalve mollusks found on the open
seacoast, especially those of the family Mactridae, as the common
American species. (Mactra, / Spisula, solidissima); -- called also
beach clam, and surf clam.