THION-

I. combining form

Etymology: International Scientific Vocabulary, from Greek theion — more at thi-

: sulfur

thion ic

II. combining form

or thiono-

Etymology: thion- International Scientific Vocabulary, from Greek theion sulfur; thiono- International Scientific Vocabulary, from Greek theion + International Scientific Vocabulary -o-

: containing sulfur doubly bound to another atom (as in the thiocarbonyl group)

thiono thiolic