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old-man cactus

[ohld-man]
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noun
  1. a Mexican cactus, Cephalocereus senilis, having a columnar body from 30 to 40 feet (9 to 12 meters) high with thatchlike, long, white hairs on the top, and red flowers with white centers.
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Origin of old-man cactus

An Americanism dating back to 1895–1900
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018