/ Dictionary / Index T thymidine: Meaning and Definition of Find definitions for: thy•mi•dine Pronunciation: (thī'mi-dēn"), [key] — n. Biochem. a nucleoside, CHNO, containing thymine and deoxyribose, that is a constituent of DNA. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: thymidine (Thesaurus) thymic thymine 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