| var. of thio- before a vowel: thiazine. |
| temperature-humidity index. |
| 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meaning “sulfur,” used in chemical nomenclature in the names of compounds in which part or all of the oxygen atoms have been replaced by sulfur; often used to designate sulfur analogues of oxygen compounds. |
thi- pref.
Variant of thio-.
thio- or thi-
pref.
Containing sulfur, used especially of a compound in which oxygen has been replaced by a divalent sulfur: thioacid.
