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iris diaphragm
noun
: an adjustable diaphragm of thin opaque plates that can be turned by a ring so as to change the diameter of a central opening usually to regulate the aperture of a lens
Word History
First Known Use
1867, in the meaning defined above
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Cite this Entry
“Iris diaphragm.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/iris%20diaphragm. Accessed 5 Nov. 2024.
Kids Definition
iris diaphragm
noun
: an adjustable diaphragm of thin plates used for changing the diameter of a central opening to control the amount of light passing (as into a microscope or camera)
Medical Definition
iris diaphragm
noun
: an adjustable diaphragm of thin opaque plates that can be turned by a ring so as to change the diameter of a central opening usually to regulate the aperture of a lens (as in a microscope)
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