Source : Webster's Revised Unabridged Dictionary (1913)

Cloaca \Clo"a"ca\, n.; pl. {Cloac[ae]}. [L.]
   1. A sewer; as, the Cloaca Maxima of Rome.

   2. A privy.

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

Source : WordNet®

cloaca
     n : a waste pipe that carries away sewage or surface water [syn:
          {sewer}, {sewerage}]
     [also: {cloacae} (pl)]