Lingo
lunette window
a small opening or lens in a door or wall that allows a person to see who is on the other side without fully opening the door
A lunette window is a small opening or lens installed in a door or wall. It allows a person to see who is on the other side without fully opening the door. This feature is often used for security purposes, as it enables someone to check who is outside before deciding to open the door. Lunette windows can come in various shapes, including circular or semi-circular designs, and are typically made of glass or other transparent materials. They provide a practical solution for enhancing safety and privacy in entrances.
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