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Meaning of rainbow cactus

rain'bow cac"tus

Pronunciation: [key]
  1. an erect stiff cactus, Echinocereus pectinatus rigidissimus, of Arizona and Mexico, having a cylindrical body, numerous interlocking spines, and pink flowers.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.