Source : Webster's Revised Unabridged Dictionary (1913)

Poi \Po"i\, n.
   A national food of the Hawaiians, made by baking and pounding
   the kalo (or taro) root, and reducing it to a thin paste,
   which is allowed to ferment.

Source : WordNet®

poi
     n : Hawaiian dish of taro root pounded to a paste and often
         allowed to ferment