a. [ Gr. 'hw`s daybreak, dawn + &unr_; 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 ]
n. [ Gr. 'hw`s dawn + "ipposhorse.] an extinct primitive dog-sized 4-toed Eocene mammal, the earliest horse known in the line of descent of the modern horse. It is classed in the extinct genus Hydracotherium. Called also dawn horse. Syn. -- dawn horse. [WordNet 1.5 +PJC]
n. [ L. Aeolis a daughter of Æolus, Gr. A'ioli`s. ] (Zoöl.) A genus of nudibranch mollusks having clusters of branchial papillæ along the back. See Ceratobranchia. [ Written also Æolis. ]
‖n. [ NL., fr. Gr. 'hw`s dawn + say^ros lizard. ] (Paleon.) An extinct marine reptile from the coal measures of Nova Scotia; -- so named because supposed to be of the earliest known reptiles. [ 1913 Webster ]
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