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单词 eocene
释义

WordReference Random House Unabridged Dictionary of American English © 2024
E•o•cene  (ē′ə sēn′),USA pronunciation [Geol.]
adj. 
  1. Geologynoting or pertaining to an epoch of the Tertiary Period, occurring from 55 to 40 million years ago and characterized by the advent of the modern mammalian orders. See table under geologic time. 

n. 
  1. Geologythe Eocene Epoch or Series.
  • eo- + -cene 1825–35

Collins Concise English Dictionary © HarperCollins Publishers::
Eocene /ˈiːəʊˌsiːn/ adj
  1. of, denoting, or formed in the second epoch of the Tertiary period, which lasted for 20 000 000 years, during which hooved mammals appeared
 n
  1. the Eocene ⇒ the Eocene epoch or rock series
Etymology: 19th Century: from eo- + -cene
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更新时间：2024/9/21 18:43:06