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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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