the GNU version of the Collaborative International Dictionary of English
n. A pipe used for carrying off surplus water.
The Century Dictionary and Cyclopedia
n. A pipe used in draining.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. a pipe through which liquid is carried away
Word Usage
"Ideally, the drainpipe is sloped or inclined approximately 2% or ¼ inch per foot of length, to keep the waste in the pipe, wet and amid liquid to lubricate and promote its slow but constant movement along the length of the pipe."