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thunder

noun
 
 
/ˈθʌn.dər/ US  /-dɚ/

Definition

B1 [U] the sudden loud noise that comes from the sky especially during a storm: a clap of thunder thunder and lightningStormy weatherWind and winds [S] a continuous loud noise: I couldn't hear what he was saying over the thunder of the waterfall.Sound and its properties
(Definition of thunder noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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