noun
1.
a. : a passageway (as for a photographic darkroom) provided with double doors, curtains, or bends to allow passage of a person while excluding light
b. : a device (as for a photographic apparatus) that allows free passage of air or movement of a sliding part but excludes light — called also light lock
2. : a device for collecting or destroying insects that consists of a bright light in association with a suitable trapping or killing medium