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iridic (1)
iridic (2)
iridium
irido-
iridology
iridosmine
iridotomy
iris
iris diaphragm
iris in
iris out
Irish
Irish coffee
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iris diaphragm
i·ris di·a·phragm (plural i·ris di·a·phragms)


noun 
Definition:
 
aperture control: a diaphragm consisting of adjustable thin plates that control the size of an aperture, especially one used in a camera to control the amount of light allowed to enter
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