Source : Webster's Revised Unabridged Dictionary (1913)

Pachisi \Pa*chi"si\, n. Commonly spelt Parchesi \Par*che"si\,
Parchisi \Par*chi"si\
   A game adopted from the Indian game, using disks, as of
   pasteboard, and dice. [U. S. & Eng.]

Pachisi \Pa*chi"si\, Parchesi \Par*che"si\, n. [Hind., fr.
   pachis twenty-five, the highest throw in the game.]
   A game, somewhat resembling backgammon, originating in India.

Source : WordNet®

pachisi
     n : an ancient board game resembling backgammon; played on a
         cross-shaped board