/ Dictionary / Index T tetra: Meaning and Definition of Find definitions for: tet•ra Pronunciation: (te'tru), [key] — n. any of several tropical, freshwater fishes of the family Characidae, often kept in aquariums. tetra- Pronunciation: [key] a combining form meaning “four,” used in the formation of compound words: tetrabranchiate. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: tetra (Thesaurus) tetr- tetrabasic Related Content Daily Word Quiz: dormant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language