Definitions
from The Century Dictionary.
- noun A heavy piece of iron, rotating on a vertical axis, serving to close a port in a turret-ship.
Etymologies
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Examples
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Nos. 3, 4, 5, and 6 man port-tackle: as muzzle approaches port-stopper, "Open Port!"
Ordnance Instructions for the United States Navy. 1866. Fourth edition. United States. Navy Dept. Bureau of Ordnance
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After the third shot from the 15-inch gun of the Nantuck a port-stopper became jammed, several shots striking very near the port and driving in the plating.
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