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From The Collaborative International Dictionary of English v.0.48:
Quahog \Qua"hog\, Quahaug \Qua"haug\, n. [Abbrev. fr. Narragansett Indian poqua[^u]hock.] (Zool.) An American market clam (Venus mercenaria). It is sold in large quantities, and is highly valued as food. Called also round clam, and hard clam. [1913 Webster] Note: The name is also applied to other allied species, as Venus Mortoni of the Gulf of Mexico. [1913 Webster] Quaigh