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 internecine
Pronunciation: ˌintərˈnesēn
adjective
destructive to both sides in a conflict