1. present participle of iris; to display colors like those of a rainbow or iris flower
Usage: often used in photography and optics contexts
2. present participle of iris; to gradually open or close an iris diaphragm (in a camera or optical device)
Usage: technical; cinematography and photography

1. the act or process of displaying iridescent colors or operating an iris diaphragm
Usage: technical; used in film, photography, and optics

Examples

• The soap bubble was irising with brilliant colors in the sunlight.
• The photographer adjusted the camera by irising the aperture to control the light.
• The oil on the water created an irising effect that caught everyone's attention.
• In the old film, the director used irising to transition between scenes.
• The gemstone was irising beautifully under the studio lights.