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Affixes: the building blocks of English
Affixes: the building blocks of English
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thio-

Sulphur

[Greek theion, sulphur.]

The form is used in chemistry to indicate the replacement of oxygen in a molecule by sulphur: a thiosulphate (US thiosulfate) is a salt containing the anion S2O32-, equivalent to a sulphate with one oxygen atom replaced by sulphur; thiourea is the sulphur analogue of urea, SC(NH2)2, used in photography and in making synthetic resins; a thiocyanate is a salt containing the anion SCN-; the adjective thionyl denotes the divalent radical ==SO.

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