/ Dictionary / Index M mGal: Meaning and Definition of Find definitions for: mGal Pronunciation: [key] milligal; milligals. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. MG MGB Related Content Daily Word Quiz: vertigo Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language