Turret deck

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Tur´ret deck

1.A narrow superstructure running from stem to stern on the upper deck of a steam cargo vessel having a rounded gunwale and sides curved inward convexly.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
Built by William Doyford and Sons of Sunderland to their patented turret deck design, her uppermost continuous deck was nipped in for its entire length so that she looked as if she had side ballast tanks like a submarine.