(n) (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
‖n.; pl.Cloacæ [ L. ] 1. A sewer; as, the Cloaca Maxima of Rome. [ 1913 Webster ]
2. A privy. [ 1913 Webster ]
3. (Anat.) The common chamber into which the intestinal, urinary, and generative canals discharge in birds, reptiles, amphibians, and many fishes. [ 1913 Webster ]