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

 

altostratus

 noun
noun
BrE BrE//ˌæltəʊˈstrɑːtəs//
 
; NAmE NAmE//ˌæltoʊˈstrɑːtəs//
 
; BrE BrE//ˌæltəʊˈstreɪtəs//
 
; NAmE NAmE//æltoʊˈstreɪtəs//
 
[uncountable, countable](pl. altostrati
BrE BrE//ˌæltəʊˈstrɑːtaɪ//
 
; NAmE NAmE//ˌæltoʊˈstrɑːtaɪ//
 
; BrE BrE//ˌæltəʊˈstreɪtaɪ//
 
; NAmE NAmE//ˌæltoʊˈstreɪtaɪ//
 
; BrE BrE//ˌæltəʊˈstrɑːtiː//
 
; NAmE NAmE//ˌæltoʊˈstrɑːtiː//
 
; BrE BrE//ˌæltəʊˈstreɪtiː//
 
; NAmE NAmE//ˌæltoʊˈstreɪtiː//
 
)
(specialist)
 
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a layer of flat clouds lying at medium height, or one of the clouds which form this layer Word Origin late 19th cent.: from modern Latin alto- (from Latin altus ‘high’) + stratus.
See the Oxford Advanced American Dictionary entry: altostratus