Alizarin (Al-I-Za'-Rin). [From al-i-za-ri, the commercial name of madder in Asia] A peculiar red coloring matter formerly obtained from the madder plant [see Turkey Red]. At present alizarin is an artificial madder-dye obtained from coal-tar, and which in point of commercial importance far exceeds any of the other 400 shades of colors derived from that source. [See Dyeing, Calico-Printing]