Aconitum napellus Aconitum napellus /ˌækəˈnaɪtəm nəˈpɛləs/

noun

1. A poisonous herb native to northern Europe having hooded blue-purple flowers; the dried leaves and roots yield aconite  ( Aconitum napellus , helmet flower , helmetflower , monkshood )
   a poisonous herb native to northern Europe having hooded blue-purple flowers; the dried leaves and roots yield aconite