Collins Concise English Dictionary © HarperCollins Publishers::

Pleistocene /ˈplaɪstəˌsiːn/ adj
  1. of, denoting, or formed in the first epoch of the Quaternary period, which lasted for about 1 600 000 years. It was characterized by extensive glaciations of the N hemisphere and the evolutionary development of man
  1. the Pleistocenethe Pleistocene epoch or rock series
Etymology: 19th Century: from Greek pleistos most + kainos recent

'Pleistocene' also found in these entries:
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