| cactus | any spiny succulent plant of the family Cactaceae native chiefly to arid regions of the New World |
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| cactus | small tree of dry open parts of southern Africa having erect angled branches suggesting candelabra |
| cactus | constituting the order Opuntiales |
| cactus | burrowing mouse of desert areas of southwestern United States |
| cactus | large harsh-voiced American wren of arid regions of the United States southwest and Mexico |