oligocene



From The Collaborative International Dictionary of English v.0.48:


Oligocene \Ol"i*go*cene\, a. [Oligo- + Gr. ? new, recent.]
   (Geol.)
   Of, pertaining to, or designating, certain strata which
   occupy an intermediate position between the Eocene and
   Miocene periods. -- n. The Oligocene period. See the Chart of
   Geology.
   [1913 Webster] Oligochaeta














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