porthole definition

  • noun:
    • Nautical a little, usually circular screen in a ship's side.
    • An opening in a fortified wall surface; an embrasure.
    • A circular screen set in the hull of a ship.
    • An embrasure in a ship's part. See 3d interface.
    • An aperture in a ship's part, specially one of several apertures whereby the weapons are protruded and fired.
    • The opening into steam-passages into or from a cylinder, or even to the exhaust-passage. See port
    • In zoology, the minute apertures or cinclides in the body-wall of a sea-anemone through which the gastric filaments or acontia tend to be protruded.
    • a window in a ship or airplane
    • an opening (in a wall or ship or armored vehicle) for firing through

Related Sources

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  • Urban Dictionary for "porthole"
    • Mild/humourous euphemism for anus.
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