1. Amaryllis is a monotypic (consisting of only one species) genus of flowering plants containing the Belladonna Lily, popularly known as the Amaryllis belladonna lily

2. Related to Amaryllises: belladonna lily, hippeastrum amaryllis (ăm'ərĭl`ĭs) , common name for some members of the Amaryllidaceae, a family of mostly perennial plants with narrow, flat leaves and with lilylike flowers borne on separate, leafless stalks.