Definition of thio- in English:

thio-

Pronunciation: /ˈθʌɪəʊ/

combining form

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

Origin

from Greek theion 'sulphur'.

Definition of thio- in:

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Word of the day ween
Pronunciation: wēn
verb
be of the opinion; think or suppose