Lanolin n. : A peculiar fatlike body, made up of cholesterin and certain fatty acids, found in feathers, hair, wool, and keratin tissues generally.

Example:
Is a Lanolin shampoo good for my shih tzu?

Taxonomy
Anhydrous lanolin, wool grease, wax, free encyclopedia, lubricant, Latin, wool fat, substance, shaving cream, skin ointment, raw material, sheep, corrosion, chemicals, crude, washing, E900, E910.

Defination from the web:
Lanolin's waterproofing property aids sheep in shedding water from their coats. Certain breeds of sheep produce large amounts of lanolin, and the extraction can be performed by squeezing the sheep's harvested wool between rollers. ...