- the fine, soft, thick, hairy coat under the longer and coarser outer hair in certain animals, as seals, otters, and beavers.
Origin of underfur
Also called underwool.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for underfur
The width of a hair in the underfur is of no taxonomic significance, in that individual variation exceeds that between species.
The guard hairs and underfur differ in different species (see figs. 35-37).
Color: Darker throughout, especially on dorsal surface due to more black of the underfur; underparts deeper buff.
The sides and underparts are lighter, due primarily to much less black in the underfur.
In mice in the earlier stages of adulthood, underfur of the dorsum is buffy at the tips and gray basally.Speciation and Evolution of the Pygmy Mice, Genus Baiomys
Robert L. Packard
- the layer of dense soft fur occurring beneath the outer coarser fur in certain mammals, such as the otter and sealAlso called: undercoat