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coastline

[kohst-lahyn] /ˈkoʊstˌlaɪn/
noun
1.
the outline or contour of a coast; shoreline.
2.
the land and water lying adjacent to a shoreline.
Origin of coastline
1855-1860
First recorded in 1855-60; coast + line1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for coastline

coastline

/ˈkəʊstˌlaɪn/
noun
1.
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
n.

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

Online Etymology Dictionary, © 2010 Douglas Harper
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11
14
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