Definition of "arnica"

arnica

noun
countable and uncountable, plural arnicas
1. Any of several plants, of the genus Arnica, considered to have medicinal properties, especially Arnica montana.
  Quotations
  His only remark was, "There's some new stuff, cuticura or something, which is better than arnica." Some people have such extraordinary notions of humor.
  1912, Arthur Conan Doyle, The Lost World […], London, New York, N.Y.: Hodder and Stoughton