noun
no men allowed; closed to men; exclusion of males
Used for places, events, or spaces where men are not permitted. Often seen on signs or in descriptions of women-only areas.
この温泉は男子禁制です。
This hot spring is closed to men.
女子会のため、今夜のパーティーは男子禁制だ。
Because it's a girls' night, tonight's party is no men allowed.
Compound of 男子 (boy, man) and 禁制 (prohibition, ban). The exact historical derivation is uncertain, but the word follows a standard Sino-Japanese pattern.