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A rail around the lower part of a ship's mast to which the belaying pins for the rigging are secured.
[Possibly from its use by the ship's fifer.]
(Nautical Terms) nautical a rail at the base of a mast of a sailing vessel, fitted with pins for belaying running rigging. Compare pin rail
[C18: of unknown origin]
a rail on a sailing vessel where belaying pins are inserted.