Source : Webster's Revised Unabridged Dictionary (1913)

Senega \Sen"e*ga\, n. (Med.)
   Seneca root.

Source : WordNet®

senega
     n 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 centers and often purple
        crest; similar to Seneca snakeroot [syn: {Polygala alba}]