1. : an incomplete deck; specifically : a portion of the deck of a sailing ship next below the spar deck between mainmast and cabin
2. : a slipper limpet of the genus Crepidula
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—half-decker, n.
(in a sailing ship) the portion of the deck below the upper or spar deck and aft of the mainmast.
[1620-30]
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n. a deck reaching half the length of a ship or boat, fore or aft
Derivatives:
half-decked adj.
Useful english dictionary. 2012.