suint

UK: /ˈsuːɪnt/, /swɪnt/ US: (so̅o̅′int, swint)

WordReference Random House Unabridged Dictionary of American English © 2025

su•int  (so̅o̅′int, swint), n. 

1. 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.

• 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
• French, Middle French, equivalent. to su(er) to sweat (
• 1785–95

Collins Concise English Dictionary © HarperCollins Publishers::

suint / ˈsuːɪnt swɪnt/ noun

1. 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

Etymology: 18th Century: from French suer to sweat, from Latin sūdāre