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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 Pars·nip n.  Bot. The aromatic and edible spindle-shaped root of the cultivated form of the Pastinaca sativa, a biennial umbelliferous plant which is very poisonous in its wild state; also, the plant itself.
 Cow parsnip. See Cow parsnip.
 Meadow parsnip, the European cow parsnip.
 Poison parsnip, the wild stock of the parsnip.
 Water parsnip, any plant of the umbelliferous genus Sium, the species of which are poisonous.

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 Cow pars·nip Bot. A coarse umbelliferous weed of the genus Heracleum (Heracleum sphondylium in England, and Heracleum lanatum in America).

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 cow parsnip
      n : tall coarse plant having thick stems and cluster of white to
          purple flowers [syn: hogweed, Heracleum sphondylium]