/ Dictionary / Index T thymine: Meaning and Definition of Find definitions for: thy•mine Pronunciation: (thī'mēn, -min), [key] — n. Biochem. a pyrimidine base, CHNO, that is one of the principal components of DNA, in which it is paired with adenine. Symbol: T Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: thymine (Thesaurus) thymidine thymocyte Related Content Daily Word Quiz: frugal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language