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[kohst-lahyn] /ˈkoʊstˌlaɪn/
the outline or contour of a coast; shoreline.
the land and water lying adjacent to a shoreline.
Origin of coastline
1855-60; coast + line1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for coastline
  • The dictator of a country with a lot of coastline is killing his people.
  • Merely a lucky orientation of the coastline and the epicenter of the quake.
  • The water that is moved by the energy is also affected by gravity, explaining the flat body of water that hits a coastline.
  • He wouldn't be needing them because he would be following the coastline south.
  • So the engineers can simulate conditions along a humid, hot coastline at sea level, or atop an arid and cold mountain.
  • There is another complicating factor, too: humankind has crowded along the coastline and the oceans are rising.
  • As you zoom in on the coastline, more detail is revealed, so that it appears to get longer.
  • The coastline is beaded with spot after spot of great waves.
  • Though sometimes crowded, the prime coastline is so vast that you can undoubtedly find an area to surf all by yourself.
  • We bump along past stretches of gorgeous tropical coastline and snake through acres of farmland.
British Dictionary definitions for coastline


the outline of a coast, esp when seen from the sea, or the land adjacent to it
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for coastline

1860, from coast (n.) + line (n.).

Online Etymology Dictionary, © 2010 Douglas Harper
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