from The American Heritage® Dictionary of the English Language, 4th Edition
- Containing sulfur, used especially of a compound in which oxygen has been replaced by a divalent sulfur: thiourea.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- containing sulfur / sulphur, especially a compound in which oxygen has been replaced by this element
from the GNU version of the Collaborative International Dictionary of English
- A combining form (also used adjectively) denoting the presence of sulphur. See sulpho-.
from The 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.
Greek theio-, from theion, sulfur.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Ancient Greek θεῖον (theion, "Sulfur") (Wiktionary)