Definition of cumulus in English:

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Pronunciation: /ˈkjuːmjʊləs/

noun (plural cumuli /ˈkjuːmjʊlʌɪ/ /ˈkjuːmjʊliː/)

[mass noun] Meteorology
Cloud forming rounded masses heaped on each other above a flat base at fairly low altitude: the high cumulus is breaking up to give a lovely summer evening [count noun]: silent, moving, red-tinged cumuli
More example sentences
  • When the air condenses into small, lumpy, low pockets of cloud, this is cumulus.
  • These types of funnel clouds form out of large cumulus clouds or very weak thunderstorms and normally do not have the energy to reach the ground.
  • The basic cloud forms are cumulus, which are heaped clouds; stratus, which are layer clouds; and cirrus, which are wispy.



Example sentences
  • The spokesperson explained that heavy thunderstorms come from cumulous cloud, which go up to 40,000 ft into the atmosphere.
  • Above the mighty fortress of earth, dark cumulous nimbus clouds clash violently against each other invoking the worst of all storms and hindering all whom dare to cross by air.
  • We were both quiet as we watched the cirrus and cumulous clouds float aimlessly in the vast opening above us.


Mid 17th century (denoting a heap or an accumulation): from Latin, 'heap'.

Words that rhyme with cumulus

altocumulus, cirrocumulus, stratocumulus, tumulus

For editors and proofreaders

Line breaks: cu¦mu|lus

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