mactra

from The Century Dictionary.

• noun The typical genus of the family Mactridæ.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Zoöl.) 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.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun 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.