- any composite plant of the genus Arnica, having opposite leaves and yellow flower heads.
- a tincture of the flowers of A. montana, of Europe, and other species of Arnica, formerly used as an external application in sprains and bruises.
- any N temperate or arctic plant of the genus Arnica, typically having yellow flowers: family Asteraceae (composites)
- the tincture of the dried flower heads of any of these plants, esp A. montana, used in treating bruises
plant genus of the borage family, 1753, Modern Latin, of unknown origin. Klein suggests Arabic arnabiyah, a name of a type of plant, as the ultimate source.