Cloaca

Webster's Dictionary

(1): (n.) The common chamber into which the intestinal, urinary, and generative canals discharge in birds, reptiles, amphibians, and many fishes.

(2): (n.) A privy.

(3): (n.) A sewer; as, the Cloaca Maxima of Rome.

Cyclopedia of Biblical, Theological and Ecclesiastical Literature

is a name applied by Gregory the Great to the baptismal font. (See Baptistery).