Definition of thio- in English:

thio-

Syllabification: thio-

combining form

Chemistry
Denoting replacement of oxygen by sulfur in a compound: thiosulphate

Origin

from Greek theion 'sulfur'.

Definition of thio- in:

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Word of the day antebellum
Pronunciation: ˌantēˈbeləm
adjective
occurring or existing before a particular war…