/ Dictionary / Index M maar: Meaning and Definition of Find definitions for: maar Pronunciation: (mär), [key] — n. Geol. a circular volcanic landform resulting from explosive ash eruptions. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: maar (Thesaurus) ma-and-pa M.A.Arch. Related Content Daily Word Quiz: overture Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language