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Definition of Cactus
1. Noun. Any succulent plant of the family Cactaceae native chiefly to arid regions of the New World and usually having spines.
Group relationships: Cactaceae, Cactus Family, Family Cactaceae
Specialized synonyms: Acanthocereus Pentagonus, Acanthocereus Tetragonus, Pitahaya, Pitahaya Cactus, Aporocactus Flagelliformis, Rat's-tail Cactus, Rattail Cactus, Ariocarpus Fissuratus, Living Rock, Carnegiea Gigantea, Saguaro, Sahuaro, Night-blooming Cereus, Coryphantha, Barrel Cactus, Echinocactus, Hedgehog Cereus, Rainbow Cactus, Epiphyllum, Orchid Cactus, Barrel Cactus, Easter Cactus, Hatiora Gaertneri, Schlumbergera Gaertneri, Night-blooming Cereus, Chichipe, Lemaireocereus Chichipe, Lophophora Williamsii, Mescal, Mezcal, Peyote, Mammillaria, Feather Ball, Mammillaria Plumosa, Garambulla, Garambulla Cactus, Myrtillocactus Geometrizans, Knowlton's Cactus, Pediocactus Knowltonii, Nopal, Prickly Pear, Prickly Pear Cactus, Cholla, Opuntia Cholla, Mistletoe Cactus, Christmas Cactus, Schlumbergera Baridgesii, Schlumbergera Buckleyi, Night-blooming Cereus, Crab Cactus, Schlumbergera Truncatus, Thanksgiving Cactus, Zygocactus Truncatus
Generic synonyms: Succulent
Specialized synonyms: Acanthocereus Pentagonus, Acanthocereus Tetragonus, Pitahaya, Pitahaya Cactus, Aporocactus Flagelliformis, Rat's-tail Cactus, Rattail Cactus, Ariocarpus Fissuratus, Living Rock, Carnegiea Gigantea, Saguaro, Sahuaro, Night-blooming Cereus, Coryphantha, Barrel Cactus, Echinocactus, Hedgehog Cereus, Rainbow Cactus, Epiphyllum, Orchid Cactus, Barrel Cactus, Easter Cactus, Hatiora Gaertneri, Schlumbergera Gaertneri, Night-blooming Cereus, Chichipe, Lemaireocereus Chichipe, Lophophora Williamsii, Mescal, Mezcal, Peyote, Mammillaria, Feather Ball, Mammillaria Plumosa, Garambulla, Garambulla Cactus, Myrtillocactus Geometrizans, Knowlton's Cactus, Pediocactus Knowltonii, Nopal, Prickly Pear, Prickly Pear Cactus, Cholla, Opuntia Cholla, Mistletoe Cactus, Christmas Cactus, Schlumbergera Baridgesii, Schlumbergera Buckleyi, Night-blooming Cereus, Crab Cactus, Schlumbergera Truncatus, Thanksgiving Cactus, Zygocactus Truncatus
Generic synonyms: Succulent
Definition of Cactus
1. n. Any plant of the order Cactacæ, as the prickly pear and the night-blooming cereus. See Cereus. They usually have leafless stems and branches, often beset with clustered thorns, and are mostly natives of the warmer parts of America.
Definition of Cactus
1. a plant native to arid regions [n -TI or -TUSES] : CACTOID [adj]