noun🔗ShareA plant of the genus Iris, common in the northern hemisphere, and generally having attractive blooms (See Iris (plant))."My grandmother loves to paint the irises that bloom in her garden every spring. "plantnaturebiologyenvironmentagricultureChat 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))."The doctor used a bright light to examine the patient's irises, checking how they responded to changes in brightness. "anatomyorganbodyphysiologyChat 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 photographer adjusted the camera's irises to let in more light for the indoor shot. "technologydevicemachinepartChat with AIVocabulary GamePractice Reading
noun🔗ShareA rainbow, or other colourful refraction of light."After the rain, irises appeared on the mist, as the sun shone through the water droplets. "phenomenaphysicsnaturecolorChat with AIVocabulary GamePractice Reading
noun🔗ShareA constricted opening in the path inside a waveguide, used to form a resonator."The engineer carefully adjusted the irises within the microwave waveguide to fine-tune the resonant frequency. "technologyphysicselectronicsdevicesignalpartChat with AIVocabulary GamePractice Reading
noun🔗ShareThe inner circle of an oscillated color spot."The shimmering soap bubble displayed irises as it floated, colorful rings spreading from the center of the light spot. "anatomyorganpartphysiologyappearancebodycolorChat with AIVocabulary GamePractice Reading
verb🔗Share(of an aperture, lens or door) To open or close in the manner of an iris."As the security camera detected movement, its lens began to iris, slowly opening to capture a clearer image. "technicalmachineactionpartstructuretechnologyChat with AIVocabulary GamePractice Reading
