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iris
noun
1 (irises , technical irides ) a perennial plant that arises from a rhizome or a corm, and has flattened sword-shaped leaves and large brilliantly coloured flowers.
2 anat an adjustable pigmented ring of muscle lying in front of the lens of the eye, surrounding the pupil, and which, through contraction or relaxation of its muscle fibres, increases or decreases the size of the pupil, thereby controlling the amount of light entering the eye.
3 (in full iris diaphragm) a device consisting of a series of thin overlapping crescent-shaped plates surrounding a central circular aperture, used to control the amount of light entering an optical instrument.
[14c: Greek, meaning -rainbow-]
noun
1 (irises , technical irides ) a perennial plant that arises from a rhizome or a corm, and has flattened sword-shaped leaves and large brilliantly coloured flowers.
2 anat an adjustable pigmented ring of muscle lying in front of the lens of the eye, surrounding the pupil, and which, through contraction or relaxation of its muscle fibres, increases or decreases the size of the pupil, thereby controlling the amount of light entering the eye.
3 (in full iris diaphragm) a device consisting of a series of thin overlapping crescent-shaped plates surrounding a central circular aperture, used to control the amount of light entering an optical instrument.
[14c: Greek, meaning -rainbow-]
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