The Collaborative International Dictionary of English v.0.48:

Photo-etch \Pho`to-etch"\, v. t. [imp. & p. p. Photo-etched;
   p. pr. & vb. n. Photo-etching.] [Photo- + etch.]
   To engrave, or make an engraving of, by any photomechanical
   process involving etching of the plate.
   [Webster 1913 Suppl.]