Ep·i·phyl·lum n.  Bot. A genus of cactaceous plants having flattened, jointed stems, and petals united in a tube. The flowers are very showy, and several species are in cultivation.
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  epiphyllum
       n : any cactus of the genus Epiphyllum having flattened jointed
           irregularly branching stems and showy tubular flowers
           [syn: orchid cactus]