porthole


port·hole

noun \ˈprt-ˌhōl\

: a small round window in the side of a ship or aircraft

Full Definition of PORTHOLE

1
:  an opening (as a window) with a cover or closure especially in the side of a ship or aircraft
2
:  a port through which to shoot
3
:  2port 2

Origin of PORTHOLE

2port
First Known Use: circa 1591

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