The Collaborative International Dictionary of English v.0.48:

Photo-engraving \Pho`to-en*grav"ing\, n. [Photo- + engraving.]
   The process of obtaining an etched or engraved plate from the
   photographic image, to be used in printing; also, a picture
   produced by such a process.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Photo-engrave \Pho`to-en*grave"\, v. t. [imp. & p. p.
   Photo-engraved; p. pr. & vb. n. Photo-engraving.] [Photo-
   + engrave.]
   To engrave by a photomechanical process; to make a
   photo-engraving of. -- Pho`to-en*grav"er, n.
   [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

photoengraving
    n 1: an engraving used to reproduce an illustration [syn:
         halftone, halftone engraving, photoengraving]