kumiss

UK: /ˈkuːmɪs/ US: (ko̅o̅′mis)

WordReference Random House Unabridged Dictionary of American English © 2025

ku•miss  (ko̅o̅′mis), n. 

1. Food fermented mare's or camel's milk, used as a beverage by Asian nomads.
2. Food a similar drink prepared from other milk, esp. that of the cow, and used for dietetic and medicinal purposes.

Also, koumis, koumiss, koumyss. 

• Turkic kιmιz
• Russian kumys
• 1590–1600

Collins Concise English Dictionary © HarperCollins Publishers::

kumiss, koumiss, koumis, koumyss / ˈkuːmɪs/ noun

1. a drink made from fermented mare's or other milk, drunk by certain Central Asian peoples or used for dietetic and medicinal purposes

Etymology: 17th Century: from Russian kumys, from Kazan Tatar kumyz