iris diaphragm

noun

Definition of iris diaphragm 

: 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

First Known Use of iris diaphragm

1867, in the meaning defined above

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The first known use of iris diaphragm was in 1867

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iris diaphragm

noun

Medical Definition of iris diaphragm 

: 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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