/ Dictionary / Index G gamma-aminobutyric acid: Meaning and Definition of Find definitions for: gam'ma-a•mi•no•bu•tyr'ic ac'id Pronunciation: (gam'u u mē"nō-by-tir'ik, -am"u-nō-). [key] See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. gamma gamma globulin Related Content Daily Word Quiz: endear Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language