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A complex red organic pigment containing iron and other atoms to which oxygen binds.hematin

1. Haematoxylin.

2. (Science: physiology) a bluish black, amorphous substance containing iron and obtained from blood. It exists the red blood corpuscles united with globulin, and the form of hemoglobin or oxyhemoglobin gives to the blood its red colour.

Origin: gr. Ai^ma, aimatos, blood.