main deck
noun
: the principal deck of a ship:
a
: the highest complete deck on a naval vessel extending the full length and width of the ship
b
: the deck next below the upper or the shelter deck on a merchant ship usually located at the end of the transverse framing
often
: the uppermost continuous deck so constructed that it is possible to close securely all openings
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Merriam-Webster unabridged
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