xanthic adjective. ['zanƟɪk] E19.
[from XANTH(O- + -IC.]
1. Chemistry. Orig., designating, pertaining to, or producing any of various yellow compounds, including xanthine. Now only spec., designating or derived from a xanthic acid (see below). E19.
xanthic acid an organic acid containing sulphur, C₂H₅OCSSH, many of whose salts are yellow; any of the colourless reactive acids of the general formula ROCSSH or ROCSSR' (where R and R' are alkyl or similar groups). xanthic oxide (now rare or obsolete) [from its yellow compound with nitric acid] = XANTHINE.

2. Yellow, yellowish. rare. M19.

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