senega

[sen-i-guh] /ˈsɛn ɪ gə/
noun
1.
the dried root of a milkwort, Polygala senega, of the eastern U.S., used as an expectorant and diuretic.
2.
the plant itself.
Origin
1730-40; variant of Seneca, from its use by this tribe
British Dictionary definitions for senega

senega

/ˈsɛnɪɡə/
noun
1.
a milkwort plant, Polygala senega, of the eastern US, with small white flowers
2.
the root of this plant, used as an expectorant
Also called (US and Canadian) senega snakeroot, seneca snakeroot
Word Origin
C18: variant of Seneca (the Indian tribe)
senega in Medicine

senega sen·e·ga (sěn'ĭ-gə)
n.
The dried roots of the Seneca snakeroot, used medicinally as an expectorant.