1. 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. 2018

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Historical Examples of underfur

British Dictionary definitions for underfur


  1. 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