n. [ See Arnica. ] (Chem.) An active principle of Arnica montana. It is a bitter resin. [ 1913 Webster ]
n. (Chem.) An alkaloid obtained from the arnica plant. [ 1913 Webster ]
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. [ 1913 Webster ]
☞ The tincture of arnica is applied externally as a remedy for bruises, sprains, etc. [ 1913 Webster ]