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coastal

[kohs-tl]
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adjective
  1. of, relating to, bordering on, or located near a coast: The coastal regions are inundated at high tide.
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Origin of coastal

First recorded in 1880–85; coast + -al1
Related formscoast·al·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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Word Origin and History for coastal

adj.

1883, from coast (n.) + -al (1). The proper Latin form costal is used only of ribs.

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Online Etymology Dictionary, © 2010 Douglas Harper