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altocumulus

noun [U]
 
 
/ˌæl.təʊˈkjuː.mjə.ləs/ US  /-toʊˈ-/ specialized

Definition

a type of cumulus (= a tall, rounded, white cloud with a flat base) found at medium height, above the level of cumulus → Compare cirrocumulus, stratocumulusClouds, dew, fog and steam
(Definition of altocumulus noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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