Chem. [a. Gr. θεῖον sulphur: cf. THIO-.] A name for sulphur taking the place of oxygen in a compound and joined by two bonds to carbon.
e.g., in methyl thioncarbamate, H2N.CS.OCH3, as distinct from methyl carbamate and methyl-thiolcarbamate: see THIOL-. (Certain words beginning with thion- do not conform to this system: see THIONIC, etc. under THIO-.)
1899. Jrnl. Chem. Soc., LXXVI. I. 797 [see THIOL-]. Ibid. (1904), LXXXVI. I. 990. The crude ester … is best converted directly into thionoxanilic acid, NHPh.CS.CO2H.
