/ Dictionary / Index M Mersin: Meaning and Definition of Find definitions for: Mer•sin Pronunciation: (mer-sēn'), [key] — n. a seaport in S Turkey, on the NW coast of the Mediterranean Sea. 130,256. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Merseyside mertensia Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language