A cactus is a plant that usually grows in dry, desert areas and has thick, fleshy stems that store water and often sharp spines instead of leaves. Many cacti produce colorful flowers.
From Latin 'cactus,' borrowed from Greek 'kaktos,' which referred to a prickly plant, probably a type of thistle. When European botanists met New World desert plants, they reused the old Greek name for these new spiky species. The scientific term stuck and became the common English word.
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