noun
peephole; door viewer
A small lens installed in a door to see who is outside. Wasei-eigo from 'door scope'; in English usually called a peephole or door viewer.
wasei-eigo (Japanese-coined English), from door scope
ドアスコープから外を見ると、知らない人が立っていた。
When I looked outside through the peephole, a stranger was standing there.
Variant with interpunct; less common but still encountered.
A more general Japanese term for a peephole or spy hole, not limited to doors.
Wasei-eigo from English 'door' and 'scope', meaning a peephole in a door.