/ Dictionary / Index M magistral line: Meaning and Definition of Find definitions for: mag'istral line" Pronunciation: [key] the line from which the position of the other lines of fieldworks is determined. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. magistral magistrate Related Content Daily Word Quiz: vertigo Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language