prop. a. [ Gr. mei`wn less + kaino`s new, fresh, recent. ] (Geol.) Of or pertaining to the middle division of the Tertiary. -- n. The Miocene period. See Chart of Geology. [ 1913 Webster ]
‖n. [ NL., fr. Gr. mei`wn less + "ippo`s horse.] (Paleon.) An extinct Miocene mammal of the Horse family, closely related to the genus Anhithecrium, and having three usable hoofs on each foot. [1913 Webster]