altostratus Definition in British English Dictionary
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Definition of "altostratus" - British English Dictionary

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altostratusnoun [U]

uk   /ˌæl.təʊˈstrɑː.təs/  us   /-toʊˈstreɪ.t̬əs/  /-ˈstrɑː-/ specialized
a type of stratus (= a flat, grey cloud) formed in thin layers and found at medium height, above the level of stratus
(Definition of altostratus from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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