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thio-(word root) sulfur
Examples of words with the root thio-: thioaldehyde
Abused, Confused, & Misused Words by Mary Embree Copyright © 2007, 2013 by Mary Embree
Containing sulfur, used especially of a compound in which oxygen has been replaced by a divalent sulfur: thiourea.
[Greek theio-, from theion, sulfur.]
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.
thio-or before a vowel
(Elements & Compounds) indicating that a chemical compound contains sulphur, esp denoting that a compound is derived from a specified compound by the replacement of an oxygen atom with a sulphur atom: thiol; thiosulphate.
[from Greek theion sulphur]
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 “sulfur” (thiobacillus), used esp. in the names of chemical compounds in which part or all of the oxygen atoms have been replaced by sulfur (thiosulfuric acid).Also, esp. before a vowel,thi-.
[comb. form representing Greek theîon]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.