Dictionary  thi•oPronunciation: (thī'ō), [key] —adj. Chem. containing sulfur, esp. in place of oxygen. thio-a combining form meaning “sulfur,” used in chemical nomenclature in the names of compounds in which part or all of the oxygen atoms have been replaced by sulfur; often used to designate sulfur analogues of oxygen compounds. Also, esp. before a vowel,thi-. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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