/ Dictionary / Index T tetrahydrozoline: Meaning and Definition of Find definitions for: tet•ra•hy•droz•o•line Pronunciation: (te"tru-hī-droz'u-lēn"), [key] — n. Pharm. a compound, CHN, used in the treatment of nasal congestion and certain conditions of eye irritation. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. tetrahydroxy tetrahymena 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