Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
semisynthetic is an adjective meaning "not of natural origin; prepared or made artificially". It carries one recorded sense.
not of natural origin; prepared or made artificially
“man-made fibers”
“synthetic leather”
chemistry
Definitions, synonyms and semantic relations for semisynthetic come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.