a. Chem. Obs. [f. UR-INE sb.1 + -OUS c.] Urous acid, oxide: (see quots.).
1855. Dunglison, Med. Dict., Urous acid, uric oxide.
1860. Mayne, Expos. Lex., 1314. Uric Oxide,… otherwise termed urous oxide, and xanthic oxide.
1878. Kingzett, Anim. Chem., 206. Xanthine … is known in old publications also as uric oxide and urous acid.
