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