al·to·cu·mu·lus
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 layer
高积云 Word Originlate 19th cent.: from modern Latin alto- (from Latin altus ‘high’) + cumulus.