an invisible image, produced on a sensitized emulsion by exposure to light, that will emerge in development.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for latent image
photog the invisible image produced by the action of light, etc, on silver halide crystals suspended in the emulsion of a photographic material. It becomes visible after development
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012