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glacial epoch

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noun
  1. Also called glacial period, ice age. the geologically recent Pleistocene Epoch, during which much of the Northern Hemisphere was covered by great ice sheets.
  2. any one of the Permian, Carboniferous, Cambrian, or Precambrian glaciations.
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Origin of glacial epoch

First recorded in 1840–50
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018