Etymology From uric, alloxan, -ic, acid. Noun uroxanic acid (uncountable) (chemistry) An acid, C5H8N4O6, which is obtained by the slow oxidation of uric acid in alkaline solution. References “uroxanic”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.