Source : Webster's Revised Unabridged Dictionary (1913)

Araceous \A*ra"ceous\, a. [L. arum a genus of plants, fr. Gr.
   ?.] (Bot.)
   Of or pertaining to an order of plants, of which the genus
   {Arum} is the type.

Source : WordNet®

araceous
     adj : relating to a plant of the family Araceae [syn: {aroid}]