Hypertext Webster Gateway: "Arnica"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Arnica \Ar"ni*ca\, n. [Prob. a corruption of ptarmica.] (Bot.)
A genus of plants; also, the most important species ({Arnica
montana}), native of the mountains of Europe, used in
medicine as a narcotic and stimulant.
Note: The tincture of arnica is applied externally as a
remedy for bruises, sprains, etc.
From WordNet (r) 1.7 (wn)
arnica
n 1: used especially in treating bruises
2: any of various rhizomatous usually perennial plants of the
genus Arnica
3: an ointment used in treating bruises
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