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Cephalocereus

noun
Ceph·​a·​lo·​cereus

Definition of Cephalocereus

: a large genus of tropical American cacti (family Cactaceae) having usually columnar erect stems topped with white wool, no leaves, and showy nocturnal flowers and including the old-man cactus

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History and Etymology for Cephalocereus

New Latin, from cephal- + Cereus

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