Syllable division and stress derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
pinnatisect is an adjective meaning "(of a leaf shape) cleft nearly to the midrib in narrow divisions not separated into distinct leaflets". It carries one recorded sense.
(of a leaf shape) cleft nearly to the midrib in narrow divisions not separated into distinct leaflets
Definitions, synonyms and semantic relations for pinnatisect come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.