Definition of glacial adjective from the Oxford Advanced Learner's Dictionary



    BrE BrE//ˈɡleɪʃl//
    ; NAmE NAmE//ˈɡleɪʃl//
    ; BrE BrE//ˈɡleɪsiəl//
    ; NAmE NAmE//ˈɡleɪsiəl//
    Mountains and valleys, Describing geographic regions
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  1. 1[usually before noun] (geology) connected with the Ice Age the glacial period (= the time when much of the northern half of the world was covered by ice)
  2. 2(specialist) caused or made by glaciers; connected with glaciers a glacial landscape glacial deposits/erosion See related entries: Mountains and valleys, Describing geographic regions
  3. 3(formal) very cold; like ice synonym icy glacial winds/temperatures the glacial waters of the Arctic The dining room was glacial.
  4. 4(formal) (of people) cold and unfriendly; not showing feelings synonym icy Her expression was glacial. Relations between the two countries had always been glacial.
  5. Word Originmid 17th cent.: from French, or from Latin glacialis ‘icy’, from glacies ‘ice’.
See the Oxford Advanced American Dictionary entry: glacial