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单词 oligocene
释义

WordReference Random House Unabridged Dictionary of American English © 2024
Ol•i•go•cene  (oli gō sēn′),USA pronunciation [Geol.]
adj. 
  1. Geologynoting or pertaining to an epoch of the Tertiary Period, occurring from 40 to 25 million years ago. See table under geologic time. 

n. 
  1. Geologythe Oligocene Epoch or Series.
  • oligo- + -cene 1855–60

Collins Concise English Dictionary © HarperCollins Publishers::
Oligocene /ˈɒlɪɡəʊˌsiːn ɒˈlɪɡ-/ adj
  1. of, denoting, or formed in the third epoch of the Tertiary period, which lasted for 10 000 000 years
n
  1. the Oligocenethe Oligocene epoch or rock series
Etymology: 19th Century: oligo- + -cene
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