/ Dictionary / Index C cGMP: Meaning and Definition of Find definitions for: cGMP Pronunciation: [key] cyclic GMP. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. cgm. cgs Related Content Daily Word Quiz: reiterate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language