/ Dictionary / Index A arnica: Meaning and Definition of Find definitions for: ar•ni•ca Pronunciation: (är'ni-ku), [key] — n. any composite plant of the genus Arnica, having opposite leaves and yellow flower heads. a tincture of the flowers of A. montana, of Europe, and other species of Arnica, formerly used as an external application in sprains and bruises. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: arnica (Thesaurus) Arnhem Land Arno Related Content Daily Word Quiz: pedagogy Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language