Source : Webster's Revised Unabridged Dictionary (1913)

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.

Photo-etching \Pho`to-etch"ing\, n.
   A photo-engraving produced by any process involving the
   etching of the plate.