'Imperatoria' definitions:

Definition of 'Imperatoria'

From: GCIDE

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]