ice age

noun Geology.
(often initial capital letters) the glacial epoch, especially the Pleistocene Epoch.

Origin:
1870–75

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Collins
World English Dictionary
ice age
 
n
another name for glacial period

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
ice age  
  1. Any of several cold periods during which glaciers covered much of the Earth.

  2. Ice Age. The most recent glacial period, which occurred during the Pleistocene Epoch and ended about 10,000 years ago. During the Pleistocene Ice Age, great sheets of ice up to two miles thick covered most of Greenland, Canada, and the northern United States as well as northern Europe and Russia.


The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The period leading up to the domestication of cereals was one of erratic
  climate change, as the last ice age ended.
We have been in a global warming period since the last ice age.
The nuclear winter fear was that debris from a nuclear war would block
  sunlight, bringing on a new ice age or worse.
Another ice age will be required to refill some depleted aquifers.
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