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A cumulus cloud.


Borrowed from Latin cumulus. Doublet of comble.



cumulus (plural cumuli)

  1. A large white puffy cloud that develops through convection. On a hot, humid day, they can form towers and even become cumulonimbus clouds.
    • 2007 September 1, "Who’s afraid of Google?: The world’s internet superpower faces testing times", in The Economist, The Economist Newspaper Ltd, ISSN 0013-0613, volume 384, number 8544, page 9,
      Ironically, there is something rather cloudlike about the multiple complaints surrounding Google. The issues are best parted into two cumuli: a set of “public” arguments about how to regulate Google; and a set of “private” ones for Google’s managers, to do with the strategy the firm needs to get through the coming storm.
  2. A mound or heap.


The translations below need to be checked and inserted above into the appropriate translation tables, removing any numbers. Numbers do not necessarily match those in definitions. See instructions at Wiktionary:Entry layout#Translations.



Borrowed from Latin cumulus.


  • IPA(key): /ˈkumulus/
  • Hyphenation: cu‧mu‧lus



  1. cumulus (cloud)


Inflection of cumulus (Kotus type 39/vastaus, no gradation)
nominative cumulus cumulukset
genitive cumuluksen cumulusten
partitive cumulusta cumuluksia
illative cumulukseen cumuluksiin
singular plural
nominative cumulus cumulukset
accusative nom. cumulus cumulukset
gen. cumuluksen
genitive cumuluksen cumulusten
partitive cumulusta cumuluksia
inessive cumuluksessa cumuluksissa
elative cumuluksesta cumuluksista
illative cumulukseen cumuluksiin
adessive cumuluksella cumuluksilla
ablative cumulukselta cumuluksilta
allative cumulukselle cumuluksille
essive cumuluksena cumuluksina
translative cumulukseksi cumuluksiksi
instructive cumuluksin
abessive cumuluksetta cumuluksitta
comitative cumuluksineen




From Proto-Indo-European *ku-m-olo, from *ḱewh₁- (to swell); see also Lithuanian saunas (firm, fit, solid, capable), Ancient Greek κύω (kúō), and Sanskrit श्वयति (śvayati, swell).



cumulus m (genitive cumulī); second declension

  1. heap, pile
  2. surplus
  3. summit


Second declension.

Case Singular Plural
nominative cumulus cumulī
genitive cumulī cumulōrum
dative cumulō cumulīs
accusative cumulum cumulōs
ablative cumulō cumulīs
vocative cumule cumulī

Derived terms[edit]



  • cumulus in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
  • cumulus in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
  • du Cange, Charles (1883), “cumulus”, in G. A. Louis Henschel, Pierre Carpentier, Léopold Favre, editors, Glossarium Mediæ et Infimæ Latinitatis (in Latin), Niort: L. Favre
  • cumulus in Gaffiot, Félix (1934) Dictionnaire Illustré Latin-Français [Illustrated Latin-French Dictionary], Hachette
  • Carl Meissner; Henry William Auden (1894) Latin Phrase-Book[1], London: Macmillan and Co.
    • his crowning happiness is produced by a thing; the culminating point of his felicity is..: ad felicitatem (magnus) cumulus accedit ex aliqua re
    • his crowning happiness is produced by a thing; the culminating point of his felicity is..: aliquid felicitatis cumulum affert
    • to add the crowning point to a person's joy: cumulum gaudii alicui afferre (vid. sect. V. 6) (Fam. 16. 21. 1)
  • cumulus in Ramminger, Johann (accessed 16 July 2016) Neulateinische Wortliste: Ein Wörterbuch des Lateinischen von Petrarca bis 1700[2], pre-publication website, 2005-2016