Found 2 items, similar to Eocene.
English → English (WordNet) Definition: Eocene Eocene n : from 58 million to 40 million years ago; presence of modern mammals [syn: Eocene epoch]
English → English (gcide) Definition: Eocene Eocene \E"o*cene\, a. [Gr. 'hw`s daybreak, dawn + ? new, recent.] (Geol.) Pertaining to the first in time of the three subdivisions into which the Tertiary formation is divided by geologists, and alluding to the approximation in its life to that of the present era; as, Eocene deposits. -- n. The Eocene formation. --Lyell. [1913 Webster]