| cactus | | |
| n. (plant) | 1. cactus | any succulent plant of the family Cactaceae native chiefly to arid regions of the New World and usually having spines. |
| ~ cactaceae, cactus family, family cactaceae | constituting the order Opuntiales. |
| ~ acanthocereus pentagonus, acanthocereus tetragonus, pitahaya, pitahaya cactus | cactus of the southwestern United States and northern Mexico having edible juicy fruit. |
| ~ aporocactus flagelliformis, rat's-tail cactus, rattail cactus | commonly cultivated tropical American cactus having slender creeping stems and very large showy crimson flowers that bloom for several days. |
| ~ ariocarpus fissuratus, living rock | usually unbranched usually spineless cactus covered with warty tubercles and having magenta flowers and white or green fruit; resembles the related mescal; northeastern Mexico and southwestern United States. |
| ~ carnegiea gigantea, saguaro, sahuaro | extremely large treelike cactus of desert regions of southwestern United States having a thick columnar sparsely branched trunk bearing white flowers and edible red pulpy fruit. |
| ~ night-blooming cereus | any of several cacti of the genus Cereus. |
| ~ coryphantha | a cactus of the genus Coryphantha. |
| ~ echinocactus, barrel cactus | any cactus of the genus Echinocactus; strongly ribbed and very spiny; southwestern United States to Brazil. |
| ~ hedgehog cereus | cactus of the genus Echinocereus. |
| ~ rainbow cactus | a stout cylindrical cactus of the southwest United States and adjacent Mexico. |
| ~ epiphyllum, orchid cactus | any cactus of the genus Epiphyllum having flattened jointed irregularly branching stems and showy tubular flowers. |
| ~ barrel cactus | a cactus of the genus Ferocactus: unbranched barrel-shaped cactus having deep ribs with numerous spines and usually large funnel-shaped flowers followed by dry fruits. |
| ~ easter cactus, hatiora gaertneri, schlumbergera gaertneri | spring-blooming South American cactus with oblong joints and coral-red flowers; sometimes placed in genus Schlumbergera. |
| ~ night-blooming cereus | any of several cacti of the genus Hylocereus. |
| ~ chichipe, lemaireocereus chichipe | tall treelike Mexican cactus with edible red fruit. |
| ~ lophophora williamsii, mescal, mezcal, peyote | a small spineless globe-shaped cactus; source of mescal buttons. |
| ~ mammillaria | any cactus of the genus Mammillaria. |
| ~ feather ball, mammillaria plumosa | a low tuberculate cactus with white feathery spines; northeastern Mexico. |
| ~ garambulla, garambulla cactus, myrtillocactus geometrizans | arborescent cactus of western Mexico bearing a small oblong edible berrylike fruit. |
| ~ knowlton's cactus, pediocactus knowltonii | small clustering cactus of southwestern United States; a threatened species. |
| ~ nopal | any of several cacti of the genus Nopalea resembling prickly pears. |
| ~ prickly pear, prickly pear cactus | cacti having spiny flat joints and oval fruit that is edible in some species; often used as food for stock. |
| ~ cholla, opuntia cholla | arborescent cacti having very spiny cylindrical stem segments; southwestern United States and Mexico. |
| ~ mistletoe cactus | a plant of the genus Rhipsalis. |
| ~ christmas cactus, schlumbergera baridgesii, schlumbergera buckleyi | epiphytic cactus of Brazilian ancestry widely cultivated as a houseplant having jointed flat segments and usually rose-purple flowers that bloom in winter. |
| ~ night-blooming cereus | any of several night-blooming cacti of the genus Selenicereus. |
| ~ crab cactus, schlumbergera truncatus, thanksgiving cactus, zygocactus truncatus | South American jointed cactus with usually red flowers; often cultivated as a houseplant; sometimes classified as genus Schlumbergera. |
| ~ succulent | a plant adapted to arid conditions and characterized by fleshy water-storing tissues that act as water reservoirs. |
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