a tropical bulbous plant (Amaryllis belladonna) of the lily family, grown for its large pink, white, or red flowers and native to S Africa
See belladonna lily in American Heritage Dictionary 4
noun
A bulbous, perennial southern African herb (Amaryllis belladonna) having showy umbels of large trumpet-shaped flowers that appear in the fall after the spring leaves die back. Also called amaryllis.