/ Dictionary / Index T tuna: Meaning and Definition of Find definitions for: tu•na Pronunciation: (t'nu, ty'-), [key] — pl. -na, -nas. any of several large food and game fishes of the family Scombridae, inhabiting temperate and tropical seas. Cf. any of various related fishes. Also calledthe flesh of the tuna, used as food. tu•na Pronunciation: (t'nu, ty'-), [key] — n. any of various prickly pears, esp. either of two erect, treelike species, Opuntia tuna or O. ficus-indica, of Mexico, bearing a sweet, edible fruit. the fruit of these plants. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: tuna (Thesaurus) tun tunable Related Content Daily Word Quiz: abscond Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language