Skip to definition.  Noun: senega  se-nu-gu   1. Dried root of
two plants of the genus Polygala containing an irritating
saponin   2. Perennial bushy herb of central and southern United
States having white flowers with green centres and often purple
crest; similar to Seneca snakeroot     - Polygala alba  Derived
forms: senegas  Type of: milkwort, root  Part of: Polygala
senega, Seneca snakeroot, senega root, senega snakeroot, Seneka
snakeroot, senga root  Encyclopedia: Senega