waste pipe

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A pipe that carries off liquid waste.

Century Dictionary and Cyclopedia

1. n. A pipe for conveying away waste water, etc.; an overflow-pipe. See waste-steam pipe, under waste, adjective

Wiktionary

1. n. a pipe that carries off liquid waste; a drain or drainpipe

GNU Webster's 1913

1. adj. The outlet pipe at the bottom of a bowl, tub, sink, or the like.

WordNet 3.0

1. n. a pipe through which liquid is carried away