iris
/ˈaɪ.ɹɪs/ noun B2- A plant of the genus Iris, common in the northern hemisphere, and generally having attractive blooms (See Iris (plant) on Wikipedia.Wikipedia ).
- 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) on Wikipedia.Wikipedia ).
- A diaphragm used to regulate the size of a hole, especially as a way of controlling the amount of light reaching a lens.
- A rainbow, or other colourful refraction of light.
- A constricted opening in the path inside a waveguide, used to form a resonator.
- The inner circle of an oscillated color spot.
Plural irises
Phrasal verbs and expressions
From the library
A white lily was not obtainable just then, but the effect of a tall blue iris placed in one of Anne’s folded hands was all that could be desired.
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