Definition of porthole noun from the Oxford Advanced Learner's Dictionary

 

porthole

 noun
noun
BrE BrE//ˈpɔːthəʊl//
 
; NAmE NAmE//ˈpɔːrthoʊl//
 
Parts of boats and ships
 
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a round window in the side of a ship or an aircraft See related entries: Parts of boats and ships
See the Oxford Advanced American Dictionary entry: porthole