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n. The soft, fine undercoat of certain mammals, such as otters, beavers, and seals.

n. The thick, soft undercoat of some mammals, especially those that spend time in the water

n. The coat of soft, fine hair, or fur, found in many mammals, overlain by longer, coarser hairs. The underfur forms the principal furs of commerce, such as the beaver, otter, fur-seal, etc.

n. thick soft fur lying beneath the longer and coarser guard hair

"In fact, the underfur was no longer available in quantity, for beaver populations had precipitously declined, a hard fact noted by old trappers who remembered the glory days when the animals were so numerous a man could whack them dead with a stick."

fur   

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