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glacial

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glacial/ˈgleɪʃəl/adjective
glacial
/ˈgleɪʃəl/
adjective
Learner's definition of GLACIAL  
: of or relating to glaciers : produced or caused by glaciers
[more glacial; most glacial]  : very cold : frigid — sometimes used figuratively
[more glacial; most glacial]  : very slow
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