iris diaphragm (English, noun)
expansion: iris diaphragm (plural iris diaphragms)
Senses:
glosses: 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.
Forms:
form: iris diaphragms
tags: plural