Iris
noun
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A plant of the genus Iris, common in the northern hemisphere, and generally having attractive blooms.
from Wiktionary, Creative Commons Attribution/Share-Alike License -
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.
from Wiktionary, Creative Commons Attribution/Share-Alike License -
A diaphragm used to regulate the size of a hole, especially as a way of controlling the amount of light reaching a lens.
from Wiktionary, Creative Commons Attribution/Share-Alike License -
A rainbow, or other colourful refraction of light.
from Wiktionary, Creative Commons Attribution/Share-Alike License -
A constricted opening in the path inside a waveguide, used to form a resonator.
from Wiktionary, Creative Commons Attribution/Share-Alike License
verb
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To open or close in the manner of an iris.
from Wiktionary, Creative Commons Attribution/Share-Alike License
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