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2 definitions found
 for iris diaphragm
From The Collaborative International Dictionary of English v.0.48 :

  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]

From WordNet (r) 3.0 (2006) :

  iris diaphragm
      n 1: diaphragm consisting of thin overlapping plates that can be
           adjusted to change the diameter of a central opening [syn:
           iris, iris diaphragm]

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