Definition of xanthic acid
1a : a colorless unstable oily thio acid C2H5OCSSH obtained in the form of its potassium salt by reaction of potassium ethoxide with carbon disulfide; O-ethyl dithio-carbonate
b : any of a series of analogous unstable thio acids ROCSSH obtained in the form of their salts by reaction of alkoxides with carbon disulfide : an O-ester of dithio-carbonic acid methyl xanthic acid CH3OCSSH
2 : a hypothetical thio acid HOCSSH whose O-esters are the xanthic acids : dithio-carbonic acid
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