turtlehead Syllabification: (tur·tle·head)Pronunciation: /ˈtərtlˌhed/Definition of turtlehead noun a North American plant of the figwort family that produces spikes of pink or white flowers that are said to resemble the head of a turtle. Genus Chelone, family Scrophulariaceae turtlehead in other Oxford dictionaries Definition of turtlehead in the British & World English dictionary