man·ni·tol (m?n??-tôl?, -t?l?, -t?l?)n. A white, crystalline, water-soluble, slightly sweet alcohol, C6H8(OH)6, found in plants, algae, and fungi. It is used in medicine, especially for its diuretic properties, and in foods as a sweetener and texturizer.[mannit(e) + -ol.]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.mannitol (?mæn??t?l) or manniten (Elements & Compounds) a white crystalline water-soluble sweet-tasting alcohol, found in plants and used in diet sweets and as a dietary supplement (E421). Formula: C6H14O6[from mannose + -ite2 + -ol1] mannitic adjCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014man?ni?tol (?mæn ??t?l, -?t?l) n. a hexahydric sugar alcohol, C6H14O6, present in many plants or synthesized, used in dietetic foods and in medicine. [1875?80; mannite an earlier name (see manna, -ite1)] Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.