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/ˈpɔː(ɹ)t.həʊl/ · noun
(archaic) A gunport; an opening in the hull of a ship through which cannons are fired..
Use porthole when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Porthole means (archaic) A gunport; an opening in the hull of a ship through which cannons are fired..
Common synonyms include bullseye, scuttle, port, embrasure.
The opposite depends on the specific sense.
Use porthole where its definition matches the intended context.
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