A porthole consists of at least two structural components and is, in its simplest form, similar to any other type of window in design and purpose. The porthole is primarily a circular glass disk, known as a …

/ ˈpɔrt·hoʊl, ˈpoʊrt- / Add to word list a small, usually round, window in the side of a ship (Definition of porthole from the Cambridge Academic Content Dictionary © Cambridge University Press)

When you get the window seat on an airplane, you'll be sitting beside a porthole, which is the name for a window on an aircraft or ship. It might sound fun to go on an ocean cruise — but it'll cost extra to stay …

A porthole is a small round window in the side of a ship or aircraft. Dan was in his cabin, staring out of a porthole. Collins COBUILD Advanced Learner’s Dictionary. Copyright © HarperCollins Publishers

Definition of porthole noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

Sep 21, 2025 · A porthole is a circular window set in a ship’s hull to allow light and ventilation into the lower decks. Portholes are also used for viewing purposes, enabling a visual connection with the …

The meaning of PORTHOLE is an opening (such as a window) with a cover or closure especially in the side of a ship or aircraft.

There are eight meanings listed in OED's entry for the noun porthole, one of which is labelled obsolete. See ‘Meaning & use’ for definitions, usage, and quotation evidence.

PORTHOLE definition: a round, windowlike opening with a hinged, watertight glass cover in the side of a vessel for admitting air and light. See examples of porthole used in a sentence.

Dec 11, 2025 · (archaic) A gunport; an opening in the hull of a ship through which cannons are fired.