main deck

noun Nautical.
the uppermost weatherproof deck, running the full length of a ship.

Origin:
1740–50

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
main deck
 
n
the uppermost sheltered deck that runs the entire length of a vessel

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Keg-size depth charges on the main deck look ready for deployment.
The main deck has ten hatches arranged in five pairs, and firewood is visible
  below deck within the forward holds.
It offers uninterrupted views from the open upper deck and a sheltered main
  deck for sightseeing.
The main deck of the catamaran is handicap-accessible.
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