Definition of masterwort
: any of several herbaceous plants (family Umbelliferae) used especially formerly in medicine: a : a coarse European plant (Imperatoria ostruthium) with large ternate leaves b : a European herb (Astrantia major) that has dark-colored aromatic roots and leaves mostly in a basal tuft and is sometimes cultivated for its showy compound umbels of white to rosy flowers c : cow parsnip d : angelica 1b
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