Meaning of diazo process

diaz'o proc"ess

Pronunciation: [key]
— Photog. Photog.
  1. a method for printing on paper treated with a diazo compound that disintegrates upon exposure to light and developing the unexposed areas by the use of diazo dyes.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.