/ Dictionary / Index M Mills cross: Meaning and Definition of Find definitions for: Mills' cross' Pronunciation: [key] a type of radio telescope consisting of two arrays of antennas perpendicular to each other. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. mill scale Mills grenade Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language