/ Dictionary / Index G glucagon: Meaning and Definition of Find definitions for: glu•ca•gon Pronunciation: (gl'ku-gon"), [key] — n. Biochem. a hormone secreted by the pancreas that acts in opposition to insulin in the regulation of blood glucose levels. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: glucagon (Thesaurus) gluc- glucaric acid Related Content Daily Word Quiz: soporific Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language