Source : Webster's Revised Unabridged Dictionary (1913)

Madnep \Mad"nep\, n. (Bot.)
   The masterwort ({Peucedanum Ostruthium}).

Masterwort \Mas"ter*wort`\, n. (Bot.)
   (a) A tall and coarse European umbelliferous plant
       ({Peucedanum Ostruthium}, formerly {Imperatoria}).
   (b) The {Astrantia major}, a European umbelliferous plant
       with a showy colored involucre.
   (c) Improperly, the cow parsnip ({Heracleum lanatum}).