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thundercloud

noun [C usually plural]
 
 
/ˈθʌn.də.klaʊd/ US  /-dɚ-/

Definition

a large, dark cloud that produces thunder and lightningClouds, dew, fog and steam
(Definition of thundercloud noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of thundercloud