un·der·coat

[uhn-der-koht]
noun
1.
a coat or jacket worn under another.
2.
Zoology. a growth of short fur or hair lying beneath a longer growth.
4.
a coat of paint or the like applied under the finishing coat.
5.
a paint, sealer, or the like specially prepared for use underneath a finishing coat.
verb (used with object)
6.
to apply an undercoating to.
00:10
Undercoat is always a great word to know.
So is platyhelminthes. Does it mean:
phylum of worms with bilateral symmetry and soft, usually flattened bodies
vertebrate with body hair that nourishes young with milk from mammary glands

Origin:
1640–50; under- + coat

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
undercoat (ˈʌndəˌkəʊt) [Click for IPA pronunciation guide]
 
n
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
 
vb
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
Their thick hollow hair and woolly undercoat hold heat and repel wind and water.
So it has all these layers of paint on it: blue, white, and an undercoat.
She is a single coated dog, with no natural undercoat.
The muskrat's fur has a dense undercoat that is virtually waterproof and
  provides excellent buoyancy for swimming.
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