Source : Webster's Revised Unabridged Dictionary (1913)

Arrack \Ar"rack\ (?; 277), n. [Ar. araq sweat, juice, spirituous
   liquor, fr. araqa to sweat. Cf. {Rack} arrack.]
   A name in the East Indies and the Indian islands for all
   ardent spirits. Arrack is often distilled from a fermented
   mixture of rice, molasses, and palm wine of the cocoanut tree
   or the date palm, etc.

Source : WordNet®

arrack
     n : any of various strong liquors distilled from the fermented
         sap of toddy palms or from fermented molasses [syn: {arak}]