in·o·si·tol (?-n??s?-tôl?, -t?l?, ?-n??-)n. Any of nine isomeric alcohols, C6H12O6·2H2O, that are precursors to various signaling molecules.[Greek ?s, ?n-, sinew; see wei- in Indo-European roots + -os(e) + -it(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.inositol (??n??s??t?l) n (Chemistry) a cyclic alcohol, one isomer of which (i-inositol) is present in yeast and is a growth factor for some organisms; cyclohexanehexol. Formula: C6H12O6[C19: from Greek in-, is sinew + -ose2 + -ite1 + -ol1]Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014in?o?si?tol (??no? s??t?l, -?to?l, a??no?-) n. a compound, C6H12O6, occurring in animal tissue, plants, and many seeds, that functions as a growth factor. [1890?95; inosite an earlier name (