skullcap: a herbaceous plant of the genus Scutellaria which has a calyx that, when inverted, resembles a helmet with its visor raised
herb: a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests
heat-seeking missile: a missile with a guidance system that directs it toward targets emitting infrared radiation (as the emissions of a jet engine)