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.
cumulous is an adjective meaning "thrown together in a pile". It carries one recorded sense.
thrown together in a pile
“a desk heaped with books”
“heaped-up ears of corn”
“ungraded papers piled high”
Definitions, synonyms and semantic relations for cumulous come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. .