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Medical Term:


Pronunciation: sĕ-nē′sē-ō, -shē-ō


  1. A large genus of plants (family Compositae), many species of which contain alkaloids that produce hepatic necrosis.
  2. A common weed of the eastern U.S., formerly used in the treatment of amenorrhea and other menstrual irregularities.

[L. a plant, groundsel, fr. senecio, an old man]