/ Dictionary / Index M master alloy: Meaning and Definition of Find definitions for: mas'ter al'loy Pronunciation: [key] an alloy rich in certain elements, used in small quantities as an additive to melts of alloyed metal. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. master master-at-arms Related Content Daily Word Quiz: eureka Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language