1. of, relating to, or producing actinic radiation; capable of producing chemical changes, especially in photography or biology
Usage: technical; scientific
2. of or relating to ultraviolet light that causes sunburn and skin damage
Usage: medical

Examples

• Actinic rays from the sun can damage skin and cause premature aging.
• The photographer used actinic light to expose the photographic plate.
• Actinic keratosis is a precancerous skin condition caused by sun exposure.
• Actinic radiation has enough energy to break chemical bonds in molecules.
• Dermatologists recommend protection from actinic UV rays year-round.
• The actinic effect of sunlight is strongest at midday.