Source : Webster's Revised Unabridged Dictionary (1913)

Aconitum \Ac`o*ni"tum\, n. [L. See {Aconite}.]
   The poisonous herb aconite; also, an extract from it.

         Strong As aconitum or rash gunpowder.    --Shak.

Source : WordNet®

Aconitum
     n : genus of poisonous plants of temperate regions of northern
         hemisphere with a vaulted and enlarged petal [syn: {genus
         Aconitum}]