Definition of cumulus noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈkjuːmjələs//
; NAmE NAmE//ˈkjuːmjələs//
[uncountable](specialist) Sky
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a type of thick white cloud See related entries: Sky Word Origin mid 17th cent. (denoting a heap or an accumulation): from Latin, ‘heap’.
See the Oxford Advanced American Dictionary entry: cumulus