from the GNU version of the Collaborative International Dictionary of English
- transitive v. To engrave by a photomechanical process; to make a photo-engraving of.
from The Century Dictionary and Cyclopedia
- To produce by or in photo-engraving.
Sorry, no etymologies found.
If used to excess after the lines have been inked in it serves to reduce the blackness of the lines, and may so pale them that they will not properly photo-engrave.
The shading on a drawing to be photo-engraved must be produced by lines, and not by tints, for tints, whether of black or of colors, will not photo-engrave properly.