pleiocene

World English Dictionary
Pleiocene (ˈplaɪəʊˌsiːn)
 
adj, —n
a variant spelling of Pliocene

Collins
World English Dictionary
Pliocene or Pleiocene (ˈplaɪəʊˌsiːn)
 
adj
1.  of, denoting, or formed in the last epoch of the Tertiary period, which lasted for three million years, during which many modern mammals appeared
 
n
2.  the Pliocene the Pliocene epoch or rock series
 
[C19: plio- + -cene, from Greek kainos recent]
 
Pleiocene or Pleiocene
 
adj
 
n
 
[C19: plio- + -cene, from Greek kainos recent]

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