Definitions for vervainˈvɜr veɪn
Random House Webster's College Dictionary
any verbena, esp. one with small flowers on spikes.
Origin of vervain:
1350–1400; ME vervaine < AF, MF verveine < L verbēna leafy twig, holy bough carried by priests
any of numerous tropical or subtropical American plants of the genus Verbena grown for their showy spikes of variously colored flowers
A herbaceous plant, Verbena officinalis, common in Europe and formerly held to have medicinal properties.
Origin: From verveine, from verbena.
any plant of the genus Verbena