ar·ni·ca noun \ˈär-ni-kə\
a capitalized : a large genus of composite herbs having flower heads that are discoid or have bright yellow rays b : a plant of the genus Arnica
a : the dried flower head of any of several herbs of the genus Arnica (especially A. montana) used for stimulant and local irritant effect especially in the form of a liniment for bruises, sprains, and swellings b : a tincture made from arnica
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