thi-

Collins
World English Dictionary
thi-
 
combining form
a variant of thio-

thio- or (before a vowel) thi-
 
combining form
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]
 
thi- or (before a vowel) thi-
 
combining form
 
[from Greek theion sulphur]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

thi- pref.
Variant of thio-.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
thio- or thi-  
A prefix that means "containing sulfur," used especially of a compound in which an oxygen atom has been replaced by a sulfur atom, as in thiourea.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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