a·liz·a·rin 
(
ə-l
ĭz
ər-
ĭn) also
a·liz·a·rine (-
ĭn, -
ə-r
ēn
′)
n. An orange-red crystalline compound, C14H8O4, used as an acid-base indicator and in making dyes.
[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 the Appendix of Semitic roots).]