thio-

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meaning “sulfur,” used in chemical nomenclature in the names of compounds in which part or all of the oxygen atoms have been replaced by sulfur; often used to designate sulfur analogues of oxygen compounds.
Also especially before a vowel, thi-.

Origin of thio-

combining form representing Greek theîon

Words nearby thio-

thinspiration, thinspo, thio, thio acid, thio salt, thio-, thio-ether, thioacetamide, thioacetic, thioacetic acid, thioacid

British Dictionary definitions for thio-

thio-

before a vowel thi-

combining form

indicating that a chemical compound contains sulphur, esp denoting that a compound is derived from a specified compound by the replacement of an oxygen atom with a sulphur atom thiol; thiosulphate

Word Origin for thio-

from Greek theion sulphur

Medical definitions for thio-

thio-

pref.

Containing sulfur, used especially of a compound in which oxygen has been replaced by a divalent sulfur:thioacid.

Scientific definitions for thio-

thio-
thi-

A prefix that means “containing sulfur,” used especially of a compound in which an oxygen atom has been replaced by a sulfur atom, as in thiourea.