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n.1.(Physiol. Chem.) Urinary hæmatin; - applied to the normal coloring matter of the urine, on the supposition that it is formed either directly or indirectly (through bilirubin) from the hæmatin of the blood. See Urochrome, and Urobilin.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.