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 loves to paint the irises that bloom in her garden every spring. " plant nature biology environment agriculture 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 : "The doctor used a bright light to examine the patient's irises, checking how they responded to changes in brightness. " anatomy organ 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 photographer adjusted the camera's irises to let in more light for the indoor shot. " technology device machine part Chat with AIVocabulary GamePractice Reading
noun Download 🔗Share A rainbow, or other colourful refraction of light. Examples : "After the rain, irises appeared on the mist, as the sun shone through the water droplets. " phenomena physics nature color Chat with AIVocabulary GamePractice Reading
noun Download 🔗Share A constricted opening in the path inside a waveguide, used to form a resonator. Examples : "The engineer carefully adjusted the irises within the microwave waveguide to fine-tune the resonant frequency. " technology physics electronics device signal part Chat with AIVocabulary GamePractice Reading
noun Download 🔗Share The inner circle of an oscillated color spot. Examples : "The shimmering soap bubble displayed irises as it floated, colorful rings spreading from the center of the light spot. " anatomy organ part physiology appearance body color 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 : "As the security camera detected movement, its lens began to iris, slowly opening to capture a clearer image. " technical machine action part structure technology Chat with AIVocabulary GamePractice Reading