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coastline

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

First recorded in 1855–60; coast + line1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for coastline

coastline

noun
  1. the outline of a coast, esp when seen from the sea, or the land adjacent to it
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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

Word Origin and History for coastline

n.

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

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Online Etymology Dictionary, © 2010 Douglas Harper