noun. a waste pipe that carries away sewage or surface water.
noun. (zoology) the cavity (in birds, reptiles, amphibians, most fish, and monotremes but not mammals) at the end of the digestive tract into which the intestinal, genital, and urinary tracts open.
1. Noun, singular or mass Once you turn the ostrich's cloaca (or vent) slightly inside out, you should be able to see if there is a phallus present on the chick.