/ Dictionary / Index T tetrahymena: Meaning and Definition of Find definitions for: tet•ra•hy•me•na Pronunciation: (te"tru-hī'mu-nu), [key] — n. Biol. any ciliated protozoan of the genus Tetrahymena, a relative of the paramecium: often used in genetics research. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: tetrahymena (Thesaurus) tetrahydrozoline tetralite Related Content Daily Word Quiz: sylvan Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language