round clam
Noun
Meaning
an edible American clam; the heavy shells were used as money by some American Indians
Atlantic coast round clams with hard shells; large clams usually used for chowders or other clam dishes
Source: WordNetSynonyms
quahog
quahaug
hard clam
hard-shell clam
Mercenaria mercenaria
venus mercenaria
littleneck
cherrystone