noun. genus of much-branched treelike or shrubby cacti with pronounced ribs and rounded needlelike spines and nocturnal flowers usually white.
1. Noun, singular or mass Use a sharp knife to cut a four- to six-inch length of stem off the night blooming cereus. 2. Noun, plural Water the night blooming cereus cutting two days after planting by misting the soil with water from the misting bottle until it is barely moist.