Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
photomechanical is an adjective meaning "of or relating to or involving various methods of using photography to make plates for printing". It carries one recorded sense.
of or relating to or involving various methods of using photography to make plates for printing
Definitions, synonyms and semantic relations for photomechanical come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.