|vīə|lu̇rik- noun
Etymology: International Scientific Vocabulary viol et + barbit uric
: a crystalline monobasic acid HON(CONH) 2 CO that is made from nitrous acid and barbituric acid or from hydroxylamine and alloxan, that tautomerizes in water from the isonitroso form to the violet nitroso form, and that forms characteristic colored salts; 5-isonitroso-barbituric acid