Eocene

[ ee-uh-seen ]

/ ˈi əˌsin /

Geology

adjective

noting or pertaining to an epoch of the Tertiary Period, occurring from 55 to 40 million years ago and characterized by the advent of the modern mammalian orders.

noun

the Eocene Epoch or Series.

Origin of Eocene

First recorded in 1825–35; eo- + -cene

OTHER WORDS FROM Eocene

post-E·o·cene, adjective

Words nearby Eocene

EO, Eoanthropus, EOB, eobiont, EOC, Eocene, EOD, EOE, EOF, EOG, Eogene

Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for Eocene

This upper part of the Eocene deposit is entirely of lacustrine formation.
The World Before the Deluge|Louis Figuier
Species much like Rhinobatus occur in the Cretaceous and Eocene.
A Guide to the Study of Fishes, Volume 1 (of 2)|David Starr Jordan
In the Eocene, however, we shall discover one very instructive case in the great Nummulitic Limestone.
The Story of the Earth and Man|J. W. Dawson
The great volcanic outbursts which produced this trap commenced in the Cretaceous period and lasted on into the Eocene period.
Encyclopaedia Britannica, 11th Edition, Volume 14, Slice 4|Various

Even in the Eocene strata of Europe, the discovery of Cetaceans has never kept pace with that of land quadrupeds.
A Manual of Elementary Geology|Charles Lyell.

British Dictionary definitions for Eocene

Eocene

/ (ˈiːəʊˌsiːn) /

adjective

of, denoting, or formed in the second epoch of the Tertiary period, which lasted for 20 000 000 years, during which hooved mammals appeared

noun

the Eocene the Eocene epoch or rock series

Word Origin for Eocene

C19: from eo- + -cene

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for Eocene

Eocene

[ ē′ə-sēn′ ]

The second epoch of the Tertiary Period, from about 58 to 37 million years ago. During the earliest part of this epoch, land connections existed between Antarctica and Australia, between Europe and North America, and between North America and Asia, and the climate was warm. The land connection between Antarctica and Australia disappeared in the mid-Eocene and early Oligocene, resulting in a change in the predominant oceanic currents and a cooler climate. With this change, the average size of mammals changed from less than 10 kg (22 lbs) to more than 10 kg. The Himalayas also formed during the Eocene, and most modern orders of mammals appeared. See Chart at geologic time.

单词	eocene
释义	Eocene [ ee-uh-seen ] / ˈi əˌsin / Geology adjective noting or pertaining to an epoch of the Tertiary Period, occurring from 55 to 40 million years ago and characterized by the advent of the modern mammalian orders. noun the Eocene Epoch or Series. Origin of Eocene First recorded in 1825–35; eo- + -cene OTHER WORDS FROM Eocene post-E·o·cene, adjective Words nearby Eocene EO, Eoanthropus, EOB, eobiont, EOC, Eocene, EOD, EOE, EOF, EOG, Eogene Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 Example sentences from the Web for Eocene This upper part of the Eocene deposit is entirely of lacustrine formation. The World Before the Deluge\|Louis Figuier Species much like Rhinobatus occur in the Cretaceous and Eocene. A Guide to the Study of Fishes, Volume 1 (of 2)\|David Starr Jordan In the Eocene, however, we shall discover one very instructive case in the great Nummulitic Limestone. The Story of the Earth and Man\|J. W. Dawson The great volcanic outbursts which produced this trap commenced in the Cretaceous period and lasted on into the Eocene period. Encyclopaedia Britannica, 11th Edition, Volume 14, Slice 4\|Various Even in the Eocene strata of Europe, the discovery of Cetaceans has never kept pace with that of land quadrupeds. A Manual of Elementary Geology\|Charles Lyell. British Dictionary definitions for Eocene Eocene / (ˈiːəʊˌsiːn) / adjective of, denoting, or formed in the second epoch of the Tertiary period, which lasted for 20 000 000 years, during which hooved mammals appeared noun the Eocene the Eocene epoch or rock series Word Origin for Eocene C19: from eo- + -cene Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 Scientific definitions for Eocene Eocene [ ē′ə-sēn′ ] The second epoch of the Tertiary Period, from about 58 to 37 million years ago. During the earliest part of this epoch, land connections existed between Antarctica and Australia, between Europe and North America, and between North America and Asia, and the climate was warm. The land connection between Antarctica and Australia disappeared in the mid-Eocene and early Oligocene, resulting in a change in the predominant oceanic currents and a cooler climate. With this change, the average size of mammals changed from less than 10 kg (22 lbs) to more than 10 kg. The Himalayas also formed during the Eocene, and most modern orders of mammals appeared. See Chart at geologic time. The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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