Dictionary

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

Illustration of IRIS DIAPHRAGM

First Known Use of IRIS DIAPHRAGM

1867

iris diaphragm

noun    (Medical Dictionary)

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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