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Cereus (n.)

cactus genus, 1730, from Latin cereus "waxen, waxy," from cera "wax" (see cero-). So called from its shape, which suggests a wax candle.

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Definitions of Cereus

Cereus (n.)
genus of much-branched treelike or shrubby cacti with pronounced ribs and rounded needlelike spines and nocturnal flowers usually white;
Synonyms: genus Cereus
From wordnet.princeton.edu