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Related to underfur: Guard hairs
The soft, fine undercoat of certain mammals, such as otters, beavers, and seals.
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 layer of dense soft fur occurring beneath the outer coarser fur in certain mammals, such as the otter and seal. Also called: undercoat
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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.