helmetflower n 1: a herbaceous plant of the genus Scutellaria which has a calyx that, when inverted, resembles a helmet with its visor raised [syn: {skullcap}, {helmetflower}] 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: {helmetflower}, {helmet orchid}] 3: 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}]