Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
superincumbent is an adjective meaning "lying or resting on and exerting pressure on something else". It carries one recorded sense.
lying or resting on and exerting pressure on something else
“superincumbent layers of dead plants cut off the air and arrested decomposition”
Definitions, synonyms and semantic relations for superincumbent come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.