/ Dictionary / Index M megadose: Meaning and Definition of Find definitions for: meg•a•dose Pronunciation: (meg'u-dōs"), [key] — n. a dose many times the usual amount, as of a vitamin or drug. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. megadontia megaelectron volt Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language