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A cactus (plural: cacti, cactuses, or cactus) is a member of the plant family Cactaceae within the order Caryophyllales. The word cactus derives, through Latin, from the Ancient Greek κάκτος, kaktos, a name originally used by Theophrastus for a spiny plant whose identity is not certain.[4] Cacti occur in a wide range of shapes and sizes. Most cacti live in habitats subject to at least some drought.