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  1. a coat or jacket worn under another.
  2. Zoology. a growth of short fur or hair lying beneath a longer growth.
  3. an undercoating.
  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)
  1. to apply an undercoating to.

Origin of undercoat

First recorded in 1640–50; under- + coat
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for undercoat

Historical Examples

  • Like the beaver, it is furnished with an undercoat of soft downy fur.

    The Western World

    W.H.G. Kingston

  • Undercote, or undercoat; fester under the skin (coat is "cutis," skin).

  • This will act as a primer or undercoat for the succeeding coats of paint.

  • In the English method, where necessary, a priming or undercoat is employed.

  • Get some sort of stuff, made of sheep's clothing, I don't know what you call 'n, for to make an undercoat for the old oman.

British Dictionary definitions for undercoat


  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
  1. (tr) to apply an undercoat to (a surface)
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