Source : Webster's Revised Unabridged Dictionary (1913)

Purim \Pu"rim\, n. [Heb. p[=u]r, pl. p[=u]r[imac]m, a lot.]
   A Jewish festival, called also the Feast of Lots, instituted
   to commemorate the deliverance of the Jews from the
   machinations of Haman. --Esther ix. 26.

Source : WordNet®

Purim
     n : (Judaism) a Jewish holy day commemorating their deliverance
         from massacre by Haman