noun
door separating inner and outer castle areas (Edo period)
A specific architectural term from the Edo period, referring to a door or gate that divided the inner citadel (honmaru) from the outer citadel (ninomaru) in Japanese castles. Not used in modern everyday language.
江戸城の御錠口は、本丸と二の丸を隔てる重要な門だった。
The o-jōguchi of Edo Castle was an important gate separating the honmaru and ninomaru.