poinsettia UK /ˌpɔɪnˈsɛ.tɪə/US /ˌpɔɪnˈsɛ.t(i)ə/ noun1 •A plant, Euphorbia pulcherrima, with rather small and insignificant flowers surrounded by large bright red leaves; native to Mexico and Central America and widely cultivated as a garden plant; widely used in Christmas floral displays.Masses of scarlet Poinsettias glowed bravely against the dark green background formed by broad-leafed plantains, whose great tattered leaves rustled with every gust of wind that reached them. — 1887 formspoinsettias