/ Dictionary / Index G GTP: Meaning and Definition of Find definitions for: GTP Pronunciation: [key] — Biochem. Biochem. guanosine triphosphate: an ester of guanosine and triphosphoric acid that is an important metabolic cofactor and precursor in the biosynthesis of cyclic GMP. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. GTO GTS Related Content Daily Word Quiz: winsome Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language