Porthole meaning

pôrt'hōl'
A small, usually circular window in a ship's side.
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An opening shaped somewhat like this, as in a furnace door.
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A circular window set in the hull of a ship.
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An opening in a fortified wall; an embrasure.
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An opening in a ship's side, esp. a round one for admitting light and air, fitted with thick glass and, often, a hinged metal cover.
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An opening to shoot through, in the wall of a fort; embrasure.
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