
1) Undercoat
Found on
https://www.crosswordclues.com/clue/underfur

1) Wool
Found on
https://www.crosswordclues.com/clue/underfur

Pale, short fine hairs in the coat that help keep the animal warm. The underfur has an oily substance that makes them water-resistant.
Found on
http://www.encyclo.co.uk/local/20085

Pale, short fine hairs in the coat that help keep the animal warm. The underfur has an oily substance that makes them water-resistant.
Found on
http://www.encyclo.co.uk/local/21498

the fine, soft, thick, hairy coat under the longer and coarser outer hair in certain animals, as seals, otters, and beavers. Also called
Found on
https://www.infoplease.com/dictionary/underfur

The short hair of a mammal; in temperate and boreal climates, the underfur ordinarily is denser, made up of more hairs, than the longer and coarser overhair.
Found on
https://www.utep.edu/leb/keys/glossary.htm
No exact match found.