cumulus

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cumulus /ˈkjuːmjələs/ noun
plural cumuli /ˈkjuːmjəˌlaɪ/
cumulus
/ˈkjuːmjələs/
noun
plural cumuli /ˈkjuːmjəˌlaɪ/
Learner's definition of CUMULUS
[count] technical
: a type of thick cloud that is rounded on top and has a flat base