Etymology
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porthole (n.)

also port-hole, "aperture on a ship's side," originally especially one through which guns are fired, 1590s, from port (n.2) + hole (n.).

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Definitions of porthole

porthole (n.)
a window in a ship or airplane;
porthole (n.)
an opening (in a wall or ship or armored vehicle) for firing through;
Synonyms: port / embrasure
From wordnet.princeton.edu