adjective
- not allowing any light to pass through; completely sealed against light
Usage: technical; photography
Examples
- The film must be stored in a lighttight container to prevent exposure.
- Make sure the darkroom door is lighttight before developing the photographs.
- The camera’s lighttight seal protects the film from unwanted exposure.
- A lighttight box is essential for storing photographic materials.
- The photographer checked that the equipment bag was completely lighttight.