| a cactus, Schlumbergera truncata (or Zygocactus truncatus), native to Brazil, having stems with leaflike segments and showy red flowers and often cultivated as a houseplant. |
| Thanksgiving cactus n. A Brazilian epiphytic cactus (Schlumbergera truncata) having irregular flowers and jointed flat stems with sharply serrate margins. Also called crab cactus. [From the time of year at which it blooms.] |
