Waste pipe Meaning, Definition & Usage

  1. noun a pipe through which liquid is carried away
    drain; drainpipe.

WordNet

Definitions
  1. a pipe for carrying off waste, or superfluous, water or other fluids. Specifically: (a) (Steam Boilers) An escape pipe. See under Escape. (b) (Plumbing) The outlet pipe at the bottom of a bowl, tub, sink, or the like.

Webster 1913