[1855–60; photo- + litho-]This word is first recorded in the period 1855–60. Other words that entered Englishat around the same time include: keyword, kickoff, output, pickup, specialistphoto- is a combining form meaning “light” (photobiology); also used to represent “photographic” or “photograph” in the formation of compoundwords. Other words that use the affix photo- include: photocoagulation, photogenic, photogravure, photopathy, photosensitivity; litho- is a combining form meaning “stone,” used in the formation of compound words. Otherwords that use the affix litho- include: lithophyte, lithopone, lithosol, lithosphere, lithotrity