coast·line

[kohst-lahyn]
noun
1.
the outline or contour of a coast; shoreline.
2.
the land and water lying adjacent to a shoreline.

Origin:
1855–60; coast + line1

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
coastline (ˈkəʊstˌlaɪn) [Click for IPA pronunciation guide]
 
n
the outline of a coast, esp when seen from the sea, or the land adjacent to it

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Coastline is always a great word to know.
So is flibbertigibbet. Does it mean:
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
a chattering or flighty, light-headed person.
Etymonline
Word Origin & History

coastline
1860, from coast + line (n.).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The water that is moved by the energy is also affected by gravity, explaining
  the flat body of water that hits a coastline.
Those with smaller canoes and kayaks can explore the mangrove-lined coastline.
The coastline is beaded with spot after spot of great waves.
Seven of the worlds biggest cities are ports, and a third of the world's
  population lives on a coastline.
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