quahogEnglishOxford New American Dictionaryquahog /ˈkwôhôɡ, ˈkwɔhɔɡ / (also quahaug) ▸ noun North American a large, rounded edible clam of the Atlantic coast of North America. Also called hard clam, hard-shell clam. Venus mercenaria, family Veneridae. – ORIGIN mid 18th century : from Narragansett poquaûhock.