main deck

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noun Nautical.

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

Origin of main deck

First recorded in 1740–50
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for main deck

main deck

noun

the uppermost sheltered deck that runs the entire length of a vessel

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