Source : Webster's Revised Unabridged Dictionary (1913)

Iridectomy \Ir`i*dec"to*my\, n. [Gr. ?, ?, iris + ? cutting out;
   ? out + ? to cut.] (Surg.)
   The act or process of cutting out a portion of the iris in
   order to form an artificial pupil.

Source : WordNet®

iridectomy
     n : surgical removal of part of the iris of the eye