from The American Heritage® Dictionary of the English Language, 4th Edition
- n. An orange-red crystalline compound, C14H6O2(OH)2, used in making dyes.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. a type of red or crimson dye
from the GNU version of the Collaborative International Dictionary of English
- n. A coloring principle, C14H6O2(OH)2, found in madder, and now produced artificially as an an orange-red crystalline compound from anthracene. It is used in making red pigments (such as the Turkish reds), and in dyeing.
from The Century Dictionary and Cyclopedia
- n. A peculiar red coloring matter (C14H8O4) formerly obtained from madder, and extensively used as a dyestuff.
- n. Commercial alizarin is sold in the form of a yellow paste containing 20 per cent. of dry substance, and, less frequently, as a dry powder. The dry substance in the paste is seldom pure alizarin, but contains varying amounts of flavopurpurin and anthrapurpurin, both of which have properties similar to alizarin. Natural alizarin derived from madder contains purpurin in addition to the above. The nature of the various commercial alizarins is often designated by suffixed letters or numbers. Thus alizarin I, alizarin P, and alizarin V are nearly pure alizarin and give blnish reds, while alizarin CA, alizarin G, etc., contain anthrapurpurin or flavopurpurin, or both, and give yellowish reds.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. an orange-red crystalline compound used in making red pigments and in dyeing
French alizarine, from alizari, madder root, from Spanish, probably from Arabic al-'uṣāra, the juice : al-, the + 'uṣāra, juice (from 'aṣara, to squeeze; see ʿṣr in Semitic roots).(American Heritage® Dictionary of the English Language, Fourth Edition)
Arabic العصارة (al-ʕuṣāra, "juice"). (Wiktionary)