Source : Webster's Revised Unabridged Dictionary (1913)

Monkshood \Monks"hood`\, n. (Bot.)
   A plant of the genus {Aconitum}; aconite. See {Aconite}.

Source : WordNet®

monkshood
     n : a poisonous herb native to northern Europe having hooded
         blue-purple flowers; the dried leaves and roots yield
         aconite [syn: {helmetflower}, {helmet flower}, {Aconitum
         napellus}]