from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A covering of soft downy hairs lying underneath the outer hairs of an animal's coat; an undercoat.


Sorry, no etymologies found.


  • The soft, luxuriant underhair of these goats is not shorn but combed, giving only a small amount of fiber each year.

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  • Upon closer look I noticed that simply her top hair are not dreaded, but only the underhair, which made it look that way.

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  • Underneath, they have a layer of thick underhair that traps air close to the body.


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