Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
spectrographically is an adverb meaning "by spectrographic means". It carries one recorded sense.
by spectrographic means
“the speech spectrum was displayed spectrographically”
Definitions, synonyms and semantic relations for spectrographically come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.