Wool fat containing about 30% water: Lanolin, a yellowish viscous substance taken from wool, is used as a base for ointments, skin medications, and cosmetics.

1. A fatty substance that is obtained from wool and which is used in skin creams to soften the skin.
2. A waxy, fatty secretion of the sebaceous glands of sheep, which is deposited on the wool fibers.
3. The purified wax-like substance from the wool of sheep, cleaned, deodorized, decolorized, and containing not more than 0.25 per cent water; used in the formulation of water-in-oil creams and ointments.

a yellowish, semisolid fat, obtained from sheep's wool, that is practically insoluble in water but which can be mixed with water to form a stable emulsion and is used as an ointment base.