Mi″o‐cene (mī″ō̍‐sēn), a. [Gr. μείων less + καινόσ new, fresh, recent.] (Geol.) Of or pertaining to the middle division of the Tertiary. — n. The Miocene period. See Chart of Geology.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.