noun🔗ShareA plant of the genus Iris, common in the northern hemisphere, and generally having attractive blooms (See Iris (plant))."My grandmother's garden has beautiful irises, their vibrant purple flowers attracting butterflies. "plantnatureorganismChat with AIVocabulary GamePractice Reading
noun🔗ShareThe contractile membrane perforated by the pupil, which adjusts to control the amount of light reaching the retina, and which forms the colored portion of the eye (See Iris (anatomy))."Her iris was a vibrant blue, expanding and contracting to let in the right amount of light as she walked from the bright sunshine into the dimly lit room. "organanatomybodyphysiologyChat with AIVocabulary GamePractice Reading
noun🔗ShareA diaphragm used to regulate the size of a hole, especially as a way of controlling the amount of light reaching a lens."The camera's iris automatically adjusted to let in more light as the sun set. "technologydevicemachinephysicsChat with AIVocabulary GamePractice Reading
noun🔗ShareA rainbow, or other colourful refraction of light."The bright iris in the sky after the rain made the children cheer. "colorphenomenaphysicsnatureChat with AIVocabulary GamePractice Reading
noun🔗ShareA constricted opening in the path inside a waveguide, used to form a resonator."The laser's waveguide contained an iris to create a stable resonance for its light beam. "technologyphysicselectronicsdeviceChat with AIVocabulary GamePractice Reading
noun🔗ShareThe inner circle of an oscillated color spot."The iris of the colorful paint sample showed a subtle shift in hues. "appearancecolorpartanatomyphysiologyChat with AIVocabulary GamePractice Reading
verb🔗Share(of an aperture, lens or door) To open or close in the manner of an iris."The camera's lens irises open wider to capture more light during the sunset. "partmachinetechnologyfunctionChat with AIVocabulary GamePractice Reading
