/ Dictionary / Index M Metroliner: Meaning and Definition of Find definitions for: Met•ro•lin•er Pronunciation: (me'trō-lī"nur), [key] — Trademark. Trademark. any of several high-speed, reserved-seat trains run by Amtrak and serving points between Boston, New York City, and Washington, D.C. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. metro metrology Related Content Daily Word Quiz: belligerent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language