noun
a type of plant that typically has thick, fleshy stems and are often covered in spines or needles
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The cactus is a type of succulent plant that is well-adapted to arid climates.
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I accidentally pricked my finger on a cactus while hiking in the desert.
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That cactus is looking pretty thorny, watch out!
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His personality is like a cactus - prickly on the outside but soft on the inside.