Cite
 

Meaning of thio

thi•o

Pronunciation: (thī'ō), [key]
— adj. Chem.
  1. containing sulfur, esp. in place of oxygen.

thio-

Pronunciation: [key]
  1. 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meaning “sulfur,” used in chemical nomenclature in the names of compounds in which part or all of the oxygen atoms have been replaced by sulfur; often used to designate sulfur analogues of oxygen compounds.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.