dimethylaminoantipyrine 4-dimethylamino-2,3-dimethyl-1-phenyl-3-pyrazolin-5-one; used as an antipyretic and analgesic in rheumatism, neuritis, pulmonary tuberculosis, and common colds; may cause leukocytopenia; used to measure total body water. Syn: amidopyrine, aminophenazone, dipyrine.