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Definition of altostratus noun from the Oxford Advanced American Dictionary

 

altostratus

 noun
noun
NAmE//ˌæltoʊˈstrɑtəs//
 
[uncountable, countable] (altostrati
NAmE//ˌæltoʊˈstrɑtaɪ//
 
)
(technology)
 
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a layer of flat clouds lying at medium height, or one of the clouds which form this layer
See the Oxford Advanced Learner's Dictionary entry: altostratus