Ordovician

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- - ordinary level
  - ordinary ray
  - ordinary seaman
  - ordinary share
  - ordinate
  - ordination
  - ordnance
  - ordnance datum
  - Ordnance Survey
  - ordonnance
  - Ordovician
  - ordure
  - öre
  - ore
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  - oread
  - orecchiette
  - orectic
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Concise Oxford English Dictionary © 2008 Oxford University Press:
Ordovician /ˌɔːdəˈvɪʃɪən/

▶adjective Geology relating to or denoting the second period of the Palaeozoic era (between the Cambrian and Silurian periods, about 510 to 439 million years ago), a time when the first vertebrates appeared.

– origin C19: from Ordovices, the L. name of an ancient British tribe, + -ian.

'Ordovician' also found in these Oxford entries:

Cambrian - Silurian

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Ordovician