/ Dictionary / Index M Mercator track: Meaning and Definition of Find definitions for: Merca'tor track" Pronunciation: [key] a line appearing straight on a Mercator chart; rhumb line. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Mercator sailing Merced Related Content Daily Word Quiz: clairvoyant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language