Mad·nep n.
  1. Bot. The masterwort (Peucedanum Ostruthium), a tall and coarse European umbelliferous plant.
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  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).
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