Lantern

From International Dictionary of Marine Aids to Navigation
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7-2-655

The glazed enclosure, usually of cylindrical or polygonal shape, at the top of a lighthouse, light vessel or buoy, which surrounds and protects the optical apparatus.




Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)

International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM