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n. pl. las·sis
A beverage made of yogurt and water and flavored with spices, fruit, or other ingredients.
[Hindi lassī, probably ultimately from Sanskrit rasaḥ, juice, liquid, milk; see rasam.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Cookery) a drink made with yoghurt or buttermilk, flavoured with sugar, salt, or a mild spice, and served cold
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014