Source : Webster's Revised Unabridged Dictionary (1913)

Arum \A"rum\, n. [L. arum, aros, Gr. ?.]
   A genus of plants found in central Europe and about the
   Mediterranean, having flowers on a spadix inclosed in a
   spathe. The cuckoopint of the English is an example.

         Our common arums -- the lords and ladies of village
         children.                                --Lubbock.

   Note: The American ``Jack in the pulpit'' is now separated
         from the genus Arum.

Source : WordNet®

arum
     n 1: starch resembling sago that is obtained from cuckoopint root
     2: any plant of the family Araceae; have small flowers massed
        on a spadix surrounded by a large spathe [syn: {aroid}]