Mio·cene /ˈmaɪəˌsin/
  第三紀中新世,第三紀中新統(a.)第三紀中新世的,第三紀中新統的
  Mi·o·cene prop. a.  Geol. Of or pertaining to the middle division of the Tertiary. -- n. The Miocene period. See Chart of Geology.
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  Miocene
       n : from 25 million to 13 million years ago; appearance of
           grazing mammals [syn: Miocene epoch]