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The soft woolly undercoat of certain animals, especially sheep.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Zoology) the lower layer of an animal's coat
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈʌn dərˌfɜr)

the soft, thick undercoat of fur animals, as the seal and beaver.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
Muskoxen (Ovibos moschatus) have been farmed since the 1960s for their fiber, called qiviut, a luxurious and highly valued underwool that is their primary insulation during the Arctic winter.
His goal was to determine whether the animal could be domesticated and used for its fine underwool, called Qiviut.
CASHMERE is the fine underwool found beneath the rough external coat of Kashmir goats which live on the mountains in the Chinese province of Inner Mongolia.