orchid cactus(n = noun.plant) epiphyllum - any cactus of the genus Epiphyllum having flattened jointed irregularly branching stems and showy tubular flowers;
is a kind of cactus
is a member of genus epiphyllum

alaska rein orchid, barrel cactus, bee orchid, blue orchid, bog rein orchid, butterfly orchid, cactus, cactus euphorbia, cactus family, cactus mouse, cactus wren, christmas cactus, coastal rein orchid, common spotted orchid, crab cactus, dancing lady orchid, early purple orchid, early spider orchid, easter cactus, fen orchid, fly orchid, foxtail orchid, fragrant orchid, fringed orchid, frog orchid, funnel-crest rosebud orchid, garambulla cactus, golden barrel cactus, greater butterfly orchid, hedgehog cactus, helmet orchid, hooker's orchid, jewel orchid, jumping orchid, knowlton's cactus, lesser butterfly orchid, lizard orchid, marsh orchid, mistletoe cactus, moth orchid, orange-blossom orchid, orchid, orchid family, orchid tree, pansy orchid, phantom orchid, pitahaya cactus, poor man's orchid, prairie orchid, prairie white-fringed orchid, prickly pear cactus, purple fringeless orchid, purple-fringed orchid, ragged orchid, ragged-fringed orchid, rainbow cactus, rat's-tail cactus, rattail cactus, rattlesnake orchid, redbird cactus, rein orchid, rosebud orchid, round-leaved rein orchid, russian cactus, satyr orchid, short-spurred fragrant orchid, slipper orchid, snow orchid, snowy orchid, spider orchid, stream orchid, swan orchid, tangle orchid, thanksgiving cactus, tulip orchid, vanilla orchid, vine cactus, water orchid, white fringed orchid, zebra orchid