Wiktionary
dead-light
n. A wooden cover of a ship's ports (window-openings), which are used to prevent water ingress in stormy weather, and to prevent glass windows breaking.
Usage examples of "dead-light".
She had, I suppose, the largest collection in the country of tales and songs, concerning devils, ghosts, fairies, brownies, witches, warlocks, spunkies, kelpies, elf-candles, dead-lights, wraiths, apparitions, cantraips, giants, enchanted towers, dragons, and other trumpery.