altocumulus
noun/ˌæltəʊˈkjuːmjʊləs/
/ˌæltəʊˈkjuːmjʊləs/
[uncountable, countable] (plural altocumuli
(specialist)/ˌæltəʊˈkjuːmjʊlaɪ/, /ˌæltəʊˈkjuːmjʊliː/
/ˌæltəʊˈkjuːmjʊlaɪ/, /ˌæltəʊˈkjuːmjʊliː/
)- a layer of round clouds with flat bottoms lying at medium height, or one of the clouds that form this layerWord Originlate 19th cent.: from modern Latin alto- (from Latin altus ‘high’) + cumulus.
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altocumulus