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