noun. genus of much-branched treelike or shrubby cacti with pronounced ribs and rounded needlelike spines and nocturnal flowers usually white.
- night-blooming cereus
- caryophylloid dicot genus
- genus Cereus
- family Cactaceae
- cactus family
Example sentences of the word cereus
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.