stratocumulus
noun/ˌstrætəʊˈkjuːmjələs/
/ˌstreɪtəʊˈkjuːmjələs/, /ˌstrætəʊˈkjuːmjələs/
[uncountable] (specialist)- a type of cloud which forms a thick grey layer low down in the sky
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stratocumulus