1. a herbaceous plant of the genus Scutellaria which has a calyx that, when inverted, resembles a helmet with its visor raised • Syn: skullcap • Hypernyms: herb, herbaceous plant 2. any of several orchids of the genus Coryanthes having racemes of a few musky-scented waxy flowers with a helmet-shaped lip process • Syn: helmet orchid • Hypernyms: orchid, orchidaceous plant • Member Holonyms: Coryanthes, genus Coryanthes 3. a poisonous herb native to northern Europe having hooded blue-purple flowers; the dried leaves and roots yield aconite • Syn: monkshood, helmet flower, Aconitum napellus • Hypernyms: aconite