1. not producing or giving off light; not luminous
Usage: technical; astronomy

Examples

• The nonluminous planets reflect light from the sun rather than producing their own.
• Dark matter is nonluminous and can only be detected through its gravitational effects.
• The nonluminous object was difficult to spot against the night sky.
• Scientists study nonluminous celestial bodies using specialized equipment.
• The nonluminous coating absorbed all visible light.
• Most asteroids are nonluminous rocks floating in space.