Oligocene

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- - Olestra
  - oleum
  - olfaction
  - olfactometer
  - olfactory
  - olfactory nerves
  - olibanum
  - oligarch
  - oligarchy
  - oligo-
  - Oligocene
  - oligochaete
  - oligoclase
  - oligodendrocyte
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  - oligodendroglioma
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  - oligomerize
  - oligonucleotide
  - oligopeptide
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Concise Oxford English Dictionary © 2008 Oxford University Press:
Oligocene /ˈɒlɪgə(ʊ)siːn/

▶adjective Geology relating to or denoting the third epoch of the Tertiary period (between the Eocene and Miocene epochs, 35.4 to 23.3 million years ago), a time when the first primates appeared.

– origin C19: from oligo- + Gk kainos ‘new’.

'Oligocene' also found in these Oxford entries:

Eocene - Miocene - Palaeogene

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Oligocene