down·com·er

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

Origin:
1865–70; down1 + comer

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
downcomer (ˈdaʊnˌkʌmə) [Click for IPA pronunciation guide]
 
n
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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00:10
Downcomer is always a great word to know.
So is callithumpian. Does it mean:
a stew of meat, vegetables, potatoes, etc.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
Example sentences
From the steam drum, gravity will cause the water to flow downward through the
  downcomer section.
Each downcomer is fitted with plates of only one range.
The reactor vessel was modeled with two core channels and split downcomer for a
  base calculation.
Downcomer pipes deliver the air to open concrete channels below the plates.
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