downspout

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down·spout

 (doun′spout′)
n.
A vertical pipe for carrying rainwater down from a roof gutter.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

downspout

(ˈdaʊnˌspaʊt)
n
(Building) US and Canadian a pipe for carrying rainwater from a roof gutter to the ground or to a drain. Also called: drainpipe or downpipe (in Britain and certain other countries)
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

down•spout

(ˈdaʊnˌspaʊt)

n.
a vertical pipe for conveying rainwater from a roof or gutter to the ground or to a drain; leader.
[1895–1900]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.