underfur

[ uhn-der-fur ]
/ ˈʌn dərˌfɜr /
|

noun

the fine, soft, thick, hairy coat under the longer and coarser outer hair in certain animals, as seals, otters, and beavers.

Origin of underfur

First recorded in 1875–80; under- + fur
Also called underwool.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for underfur

underfur

/ (ˈʌndəˌfɜː) /

noun

the layer of dense soft fur occurring beneath the outer coarser fur in certain mammals, such as the otter and sealAlso called: undercoat
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