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

 

arnica

 noun
noun
BrE BrE//ˈɑːnɪkə//
 
; NAmE NAmE//ˈɑːrnɪkə//
 
[uncountable]
 
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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 Origin mid 18th cent.: modern Latin, of unknown origin.
See the Oxford Advanced American Dictionary entry: arnica