iris diaphragm

Noun
Synonyms: irisiris diaphragm

WordNet 3.0

Noun (1)

  1. diaphragm consisting of thin overlapping plates that can be adjusted to change the diameter of a central openingSynonyms: irisiris diaphragm
Advertisement

Webster's Dictionary (GCIDE)

Iris diaphragm \I"ris di"a*phragm\ An adjustable diaphragm, reminiscent of the iris of the eye in its action, 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. [Webster 1913 Suppl. +PJC]
Advertisement