WordWeb Online

1. (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
    
2. A waste pipe that carries away sewage or surface water
   - sewer, sewerage

Derived forms: cloacae

Type of: bodily cavity, cavity, cavum, drain, drainpipe, waste pipe

Part of: sewage system, sewage works, sewer system

Encyclopedia: Cloaca