Source : WordNet®

hard-shell clam
     n 1: Atlantic coast round clams with hard shells; large clams
          usually used for chowders or other clam dishes [syn: {quahaug},
           {quahog}, {round clam}]
     2: an edible American clam [syn: {quahog}, {quahaug}, {round
        clam}, {Venus mercenaria}, {Mercenaria mercenaria}]