Origin of underwool
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for underwool
The underwool is long and soft and the hair plentiful and strong.
Its hair is more like that of a goat than a sheep, of a brownish gray colour, and with a dense coat of underwool.The Backwoodsman
The underwool is short and soft, as is also the top hair, which is of very pale grey mixed with some yellowish-white hair.
Those skins in which the underwool is quite white are rare and much more expensive.
The underwool is short and rather weak, but regular, as is also the top hair; the colour is usually yellow.