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arnicin
arnicin n. 
/ˈɑːnɪsɪn/ Chemistry a yellow, non-crystallizable, bitter substance, the active principle of arnica.
/ˈɑːnɪsɪn/ Chemistry a yellow, non-crystallizable, bitter substance, the active principle of arnica.ΘΚΠ
the world > matter > chemistry > organic chemistry > neutral substances from plants > bitter principles > [noun] > non-crystallizable
arnicin1876
1876 J. Harley Royle's Man. Materia Med. (ed. 6) 537 The root is rich in arnicin.
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