1. (noun) a waste pipe that carries away sewage or surface water

• sewer
• sewerage

1. (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

• bodily cavity
• cavity
• cavum

2. (noun) a waste pipe that carries away sewage or surface water

• drain
• drainpipe
• waste pipe

1. (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

• zoological science
• zoology