The Collaborative International Dictionary of English v.0.48:
Monkshood \Monks"hood`\, n. (Bot.) A plant of the genus Aconitum; aconite. See Aconite. [1913 Webster]WordNet (r) 3.0 (2006):
monkshood n 1: a poisonous herb native to northern Europe having hooded blue-purple flowers; the dried leaves and roots yield aconite [syn: monkshood, helmetflower, helmet flower, Aconitum napellus]