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tauto-(word root) same
Abused, Confused, & Misused Words by Mary Embree Copyright © 2007, 2013 by Mary Embree
Same; identical: tautomerism.
[Greek, from tauto, the same, contraction of to auto : to, the; see to- in Indo-European roots + auto, neuter of autos, same, self.]
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.
tauto-or before a vowel
identical or same: tautology; tautonym.
[from Greek tauto, from to auto]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
a combining form meaning “same”: tautomerism.
[< Greek, comb. form of tautó, contraction of tò autó the same]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.