Breadcrumb Home > Dictionary > Index M maser: Meaning and Definition of Find definitions for: ma•ser Pronunciation: (mā'zur), [key] — n. a device for amplifying electromagnetic waves by stimulated emission of radiation. Cf. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: maser (Thesaurus) Masefield Maseru ✖ Related Content Daily Word Quiz: triumphalism Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language