American Heritage® Dictionary of the English Language, Fourth Edition
- Containing sulfur, used especially of a compound in which oxygen has been replaced by a divalent sulfur: thiourea.
Century Dictionary and Cyclopedia
- n. In chem., a prefix now restricted to the names of substances in which sulphur may properly be viewed as replacing oxygen. In the older names for such substances the prefix sulpha- was often used.
- chemistry containing sulfur / sulphur, especially a compound in which oxygen has been replaced by this element
GNU Webster's 1913
- (Chem.) A combining form (also used adjectively) denoting
the presence of sulphur. See sulpho-.
- From Ancient Greek θεῖον (theion, "Sulfur") (Wiktionary)
- Greek theio-, from theion, sulfur. (American Heritage® Dictionary of the English Language, Fourth Edition)
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