night-blooming cereus definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
any of various cactuses that bloom at night, esp. any of many species (genera Hylocereus, Selenicereus, etc.), often grown as house plants
night-blooming cereus definition by American Heritage Dictionary
Any of various night-blooming cacti of the genera Hylocereus, Nyctocereus, Peniocereus, and Selenicereus, having large fragrant flowers.