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downcomer

[doun-kuhm-er]
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noun
  1. a pipe, tube, or passage for conducting fluid materials downward.
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Origin of downcomer

First recorded in 1865–70; down1 + comer
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for downcomers

downcomer

noun
  1. a pipe that connects a cistern to a WC, wash basin, etcAlso called: downcome
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012