Drainpipe (noun)

1. A pipe used to carry away waste water or rainwater from a building.
2. A vertical pipe that carries waste water away from a sink, toilet, or other plumbing fixture.

Origin:

Late 19th century: from drain + pipe.

Examples:

1. The drainpipe was clogged with leaves and dirt.
2. She checked the drainpipes for leaks and found one that needed to be fixed.
3. The drainpipe was long and narrow, making it difficult to clean.
4. The drainpipe was made of metal and was painted black.
5. The drainpipe ran down the side of the building to the street below.