a raised border around an opening in a deck, roof, or floor, designed to prevent water from running below.

1605–15; earlier coming, apparently equivalent to comb (in sense “crest”) + -ing1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
coaming (ˈkəʊmɪŋ)
a raised frame around the cockpit or hatchway of a vessel for keeping out water
[C17: of unknown origin]

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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Word Origin & History

early 17c., of unknown origin.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
He tripped over a coaming and struck his head on a vent pipe.
He knew of the risk of shock, so he stood on the coaming around the door opening before reaching for the welding machine.
Overfilling can be prevented by filling the barge only to the bottom of the barge coaming.
The pontoon came to rest partly on the winch and partly on the hatch coaming.
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