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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Astrantia major
n : European herb with aromatic roots and leaves in a basal tuft
and showy compound umbels of white to rosy flowers [syn:
greater masterwort]