the natural grease of the wool of sheep, consisting of a mixture of fatty matter and potassium salts, used as a source of potash and in the preparation of ointments.
Origin: 1785–95; < French, Middle French, equivalent to su(er) to sweat (< Latin sūdāre;see sweat) + -in suffix of mass nouns (as in crottin dung); -t after oint, past participle of oindre to rub with oil, anoint
a water-soluble substance found in the fleece of sheep, consisting of peptides, organic acids, metal ions, and inorganic cations and formed from dried perspiration
[C18: from French suer to sweat, from Latin sūdāre]