WordReference Random House Unabridged Dictionary of American English © 2017
ar•ni•ca  (ärni kə),USA pronunciation n. 
  1. Plant Biologyany composite plant of the genus Arnica, having opposite leaves and yellow flower heads.
  2. Drugsa tincture of the flowers of A. montana, of Europe, and other species of Arnica, formerly used as an external application in sprains and bruises.
  • ?
  • Neo-Latin
  • 1745–55

Collins Concise English Dictionary © HarperCollins Publishers::

arnica /ˈɑːnɪkə/ n
  1. any N temperate or arctic plant of the genus Arnica, typically having yellow flowers: family Asteraceae (composites)
  2. the tincture of the dried flower heads of any of these plants, esp A. montana, used in treating bruises
Etymology: 18th Century: from New Latin, of unknown origin


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