Definition of cactus Cactus
/kæˈktʌs/ - [kaktus] - cac•tus
We found 9 definitions of cactus from 7 different sources.
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What does cactus mean?
WordNet
NounPlural: cacti |
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| cactus - any succulent plant of the family Cactaceae native chiefly to arid regions of the New World and usually having spines | ||
| succulent a plant adapted to arid conditions and characterized by fleshy water-storing tissues that act as water reservoirs | ||
| cactaceae, cactus family, family cactaceae constituting the order Opuntiales | ||
| acanthocereus pentagonus, acanthocereus tetragonus, pitahaya cactus, pitahaya 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 Cereus | ||
| chichipe, lemaireocereus chichipe tall treelike Mexican cactus with edible red fruit | ||
| lophophora williamsii, mezcal, mescal, peyote a colorless Mexican liquor distilled from fermented juices of certain desert plants of the genus Agavaceae (especially the century plant) | ||
| mammillaria any cactus of the genus Mammillaria | ||
| feather ball, mammillaria plumosa a low tuberculate cactus with white feathery spines; northeastern Mexico | ||
| garambulla cactus, myrtillocactus geometrizans, garambulla small 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 cactus, prickly pear round or pear-shaped spiny fruit of any of various prickly pear cacti | ||
| 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 cacti of the genus Cereus | ||
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Wiktionary 
Webster DictionaryWebster's Unabridged Dictionary 📘
- cactus (n.)
Any plant of the order Cactacae, 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.
OmegaWiki DictionaryOmegaWiki Dictionary Ω
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cactus
Any member of the family Cactaceae, a family of New World succulent plants suited to a hot, semi-desert climate.
Chambers DictionaryChamber's 20th Century Dictionary 📕
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cactus
kak′tus, n. an American plant, generally with prickles instead of leaves.—adj. Cactā′ceous, pertaining to or like the cactus. [Gr., a prickly plant found in Sicily.]
Wikipedia 
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A cactus is a kind of plant. The plural of cactus can be cacti or cactuses or cactus.
Cacti first came from North America or South America. Many people like to grow cactus in pots or gardens. Now cacti have spread to many other parts of the world.
Many cacti live in dry places, such as deserts. Most cacti have and sharp thorns (stickers) and thick skin. There are many shapes and sizes of cacti. Some are short and round; others are tall and thin. Many cactus flowers are big and beautiful. Some cactus flowers bloom at night and are pollenated by moths and bats. Some cactus fruits are brightly coloured and good to eat. Goats, birds, ants, mice, bats and people eat cactus fruits.
Adaptations.
An adaptation is anything that helps a living thing survive and make more of its own kind. Cactuses have many adaptations for living in places that are sometimes dry for a long time. At other times these places can get lots of rain.
Cacti can have many small, thin roots near the top of the soil. These roots take in water quickly after a rain. The same cactus may have one long, thick root called a taproot. The taproot grows deep in the soil. It can reach water when the soil on top is dry.
Cacti store water in thick stems. The stems are covered with tough skin, and the skin is covered with wax. The thick waxy skin slows down loss of water. The leaves of cacti are sharp spines (thorns, stickers). Many animals want the water inside the cactus, but the sharp spines and thick skin protect the cact
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