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Iris diaphragm

noun

Definitions

Noun
  1. 1
    An adjustable diaphragm by which the diameter of an approximately circular opening may be controlled, as for regulating the aperture of a lens; it consists of a number of movable thin curved plates fastened at regular intervals around the inside of a ring, the positions of which are simultaneously adjusted by a single knob on the outside of the lens. It is used in cameras and microscopes.
  2. 2
    diaphragm consisting of thin overlapping plates that can be adjusted to change the diameter of a central opening wordnet

Etymology

Derives from its action which is reminiscent of the iris of the eye.

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