a coat or jacket worn under another.
Zoology. a growth of short fur or hair lying beneath a longer growth.
a coat of paint or the like applied under the finishing coat.
a paint, sealer, or the like specially prepared for use underneath a finishing coat.
verb (used with object)
to apply an undercoating to.

1640–50; under- + coat

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
undercoat (ˈʌndəˌkəʊt)
1.  a coat of paint or other substance applied before the top coat
2.  a coat worn under an overcoat
3.  zoology another name for underfur
4.  the US name for underseal
5.  (tr) to apply an undercoat to (a surface)

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
The muskox sheds this undercoat when the weather gets warmer.
The polar bear's fur is thicker than that of any other bear, consisting of
  guard hairs of varied lengths and a dense undercoat.
She is a single coated dog, with no natural undercoat.
While the undercoat on the woodwork is drying he'll slip the new tiles in.
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