Webster’s Revised Unabridged Dictionary · 1913
Masterwort
Mas′ter·wort′ (·wûrt′), 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).