Definition of arnica noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈɑːnɪkə//
; NAmE NAmE//ˈɑːrnɪkə//
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a natural medicine made from a plant, used to treat bruises (= marks that appear on the skin after somebody has fallen, been hit, etc.) Word Originmid 18th cent.: modern Latin, of unknown origin.
See the Oxford Advanced American Dictionary entry: arnica