/ Dictionary / Index C coastline: Meaning and Definition of Find definitions for: coast•line Pronunciation: (kōst'līn"), [key] — n. the outline or contour of a coast; shoreline. the land and water lying adjacent to a shoreline. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: coastline (Thesaurus) coastland coast live oak Related Content Daily Word Quiz: diaphanous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language