The Collaborative International Dictionary of English v.0.48:

Alizari \A`li*za"ri\, n. [Perh. fr. Ar. 'a[,c][=a]rah juice
   extracted from a plant, fr. 'a[,c]ara to press.] (Com.)
   The madder of the Levant. --Brande & C.
   [1913 Webster] Alizarin