Madnep \Mad"nep\, n. 1. (Bot.) The masterwort ({Peucedanum Ostruthium}), a tall and coarse European umbelliferous plant. [1913 Webster] 2. (Bot.) A biennial weed in Europe and America having large pinnate leaves and yellow flowers and a bitter and somewhat poisonous root; the ancestor of cultivated parsnip; called also {wild parsnip}. [WordNet 1.5]
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}). [1913 Webster]