a layer of any substance spread over a surface.
fabric for making coats.

1760–70; coat + -ing1

1. coat, covering, film, sheet, veneer. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
coating (ˈkəʊtɪŋ)
1.  a layer or film spread over a surface for protection or decoration
2.  a heavy fabric suitable for coats
3.  dialect (Midland English) a severe rebuke; ticking-off

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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Word Origin & History

c.1300, "outer garment," from O.Fr. cote, from Frank. *kotta "coarse cloth," of unknown origin. Transferred to animal's natural covering late 14c. Extended 1660s to a layer of any substance covering any surface.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

coat (kōt)
The outer covering or enveloping layer or layers of an organ or part.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences for coatings
A thin layer of coatings was applied to improve the color of the tanzanite.
The balance is mainly used as a pigment in inks, coatings and plastics.
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