Top Definition
A medicinal herb with yellow flowers that belongs to the sunflower family. Used as an anti-inflammatory for strains, sprains, bruises and muscles soreness.

Don't eat it. Arnica contains the toxin helenalin, which can be poisonous if large amounts of the plant are eaten.
I had a huge bruise from falling but Arnica took the pain away.
by chacha5 February 10, 2010

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