Yōlk, n.

(yōlk, or yŏk, 20) (Synop., § 130), n.

1. The yelk of an egg. See YELK.
2. An unctuous secretion from the skin of sheep.

All wool, in its natural state, contains a quantity of a peculiar pot-ash soap, called in this country [Great Britain] the yelk, which may be washed out by water alone, with which it forms a sort of lather. Ure. 3. (Bot.) The vitellus, a part of the seed of plants. [Obs.]