noun Download 🔗Share A plant of the genus Iris, common in the northern hemisphere, and generally having attractive blooms (See Iris (plant)). Examples : "My grandmother's garden has beautiful irises, their vibrant purple flowers attracting butterflies. " plant nature organism Chat with AIVocabulary GamePractice Reading
noun Download 🔗Share The 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)). Examples : "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. " organ anatomy body physiology Chat with AIVocabulary GamePractice Reading
noun Download 🔗Share A diaphragm used to regulate the size of a hole, especially as a way of controlling the amount of light reaching a lens. Examples : "The camera's iris automatically adjusted to let in more light as the sun set. " technology device machine physics Chat with AIVocabulary GamePractice Reading
noun Download 🔗Share A rainbow, or other colourful refraction of light. Examples : "The bright iris in the sky after the rain made the children cheer. " color phenomena physics nature Chat with AIVocabulary GamePractice Reading
noun Download 🔗Share A constricted opening in the path inside a waveguide, used to form a resonator. Examples : "The laser's waveguide contained an iris to create a stable resonance for its light beam. " technology physics electronics device Chat with AIVocabulary GamePractice Reading
noun Download 🔗Share The inner circle of an oscillated color spot. Examples : "The iris of the colorful paint sample showed a subtle shift in hues. " appearance color part anatomy physiology Chat with AIVocabulary GamePractice Reading
verb Download 🔗Share (of an aperture, lens or door) To open or close in the manner of an iris. Examples : "The camera's lens irises open wider to capture more light during the sunset. " part machine technology function Chat with AIVocabulary GamePractice Reading