photomechanical Syllabification: (pho·to·me·chan·i·cal)Pronunciation: /ˌfōtōməˈkanikəl/Definition of photomechanical adjective relating to or denoting processes in which photography is involved in the making of a printing plate. Derivatives photomechanicallyPronunciation: /-ik(ə)lē/ adverb photomechanical in other Oxford dictionaries Definition of photomechanical in the British & World English dictionary