Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
photo-offset is a noun meaning "a method of offset printing using photomechanical plates". It carries one recorded sense.
a method of offset printing using photomechanical plates
Definitions, synonyms and semantic relations for photo-offset come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.