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Christmas cactus

a common houseplant (Schlumbergera bridgesii) with flat, jointed, fleshy stems and red flowers that bloom around Christmas; crab cactus

See Christmas cactus in American Heritage Dictionary 4

noun
An epiphytic cactus (Schlumbergera ˣbridgesii) of Brazilian ancestry, widely cultivated as a houseplant and having jointed flat segments with crenate margins and showy, often magenta or rose-purple flowers that bloom in winter.

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Christmas cactus

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