underfur

• 指许多哺乳动物皮肤上位于较长、较粗糙的针毛下方的浓密柔软的绒毛层，主要起保温作用。

A noun referring to the dense, soft layer of fur found beneath the longer and coarser guard hairs of many mammals, providing insulation.

不可数

1. Dense soft fur layerC1formal

   The thick, soft, and insulating layer of fur that grows beneath the longer, coarser guard hairs on many mammals.

   底绒

   • The underfur of the otter provides excellent insulation in cold water.
   • Many arctic animals have a dense underfur to survive freezing temperatures.
   • The dog's underfur sheds heavily in the spring.
   • The underfur is typically softer and shorter than the outer guard hairs.

   同义词downundercoat