a pipe, tube, or passage for conducting fluid materials downward.

1865–70; down1 + comer Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
downcomer (ˈdaʊnˌkʌmə)
Also called: downcome a pipe that connects a cistern to a WC, wash basin, etc

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
The reactor vessel was modeled with two core channels and split downcomer for a
  base calculation.
Natural circulation flow was induced by the difference in density between the
  riser and downcomer pipes.
There the liquid is separated and sent back down via a side downcomer.
Each downcomer is fitted with plates of only one range.
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