Open porthole Synonyms

Definitions for Open

(adjective) allowing passage without obstruction
(adjective) freely available for use or participation by all
(adjective) being in a situation where one is likely to meet with harm

OP abbreviation

OP is an abbreviation for Open Porthole

What does OP stand for?

OP stands for "Open Porthole"

Porthole replaced

open aperture

open fracture

Definitions for Porthole

(noun) a window in a ship or airplane
(noun) an opening (in a wall or ship or armored vehicle) for firing through