THIA-

I. combining form

or thi-

Etymology: International Scientific Vocabulary, from thi- + -a-

: containing sulfur in place of carbon or regarded as in place of carbon usually in place of the methylene group −CH 2 −

thia cyclohexane

thia diazole

thi azole

— compare aza- , oxa-

II. combining form

: thi-

thia chroman