/ Dictionary / Index M Mercator sailing: Meaning and Definition of Find definitions for: Merca'tor sail'ing Pronunciation: [key] sailing according to rhumb lines, which appear as straight lines on a Mercator chart. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Mercator projection Mercator track Related Content Daily Word Quiz: nonchalant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language