Etymology
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arnica (n.)

plant genus of the borage family, native to central Europe, 1753, Modern Latin, of unknown origin. Klein suggests Arabic arnabiyah, a name of a type of plant, as the ultimate source.

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Definitions of arnica

arnica (n.)
used especially in treating bruises;
arnica (n.)
any of various rhizomatous usually perennial plants of the genus Arnica;
arnica (n.)
an ointment used in treating bruises;
From wordnet.princeton.edu