Proterozoic

[ prot-er-uh-zoh-ik, proh-ter- ]

/ ˌprɒt ər əˈzoʊ ɪk, ˌproʊ tər- /

Geology

adjective

noting or pertaining to the latter half of the Precambrian Era, from about 2.5 billion to 570 million years ago, characterized by the appearance of bacteria and marine algae; Algonkian.

noun

the Proterozoic division of geologic time or the rock systems formed then; Algonkian.

Origin of Proterozoic

First recorded in 1905–10; protero- + zo- + -ic

Words nearby Proterozoic

proteometabolism, proteomics, proteose, protero-, proterotype, Proterozoic, protest, Protestant, Protestant Episcopal Church, Protestant Episcopal Church in the United States, Protestant ethic

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

Example sentences from the Web for Proterozoic

Similar forms are abundant in late Proterozoic strata of Montana.
Geology|William J. Miller
In regard to abundance of fossil animals the oldest (Cambrian) Paleozoic strata stand out in marked contrast to the Proterozoic.
Geology|William J. Miller
The later Proterozoic strata have been much less deformed and in many cases they are practically unaltered.
Geology|William J. Miller
Hence, uplift alone cannot account for extensive glaciation in subtropical latitudes during the Permian and Proterozoic.
Climatic Changes|Ellsworth Huntington

This second series of rocks is called the Proterozoic (beginning of life) series, and marks a long age in the worlds history.
The Outline of History: Being a Plain History of Life and Mankind|Herbert George Wells

British Dictionary definitions for Proterozoic

Proterozoic

/ (ˌprəʊtərəʊˈzəʊɪk) /

noun

the later of two divisions of the Precambrian era, during which the earliest plants and animals are assumed to have livedCompare Archaeozoic

adjective

of or formed in the late Precambrian era

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 Proterozoic

Proterozoic

[ prŏt′ər-ə-zō′ĭk ]

The later of the two divisions of the Precambrian Eon, from about 2.5 billion to 540 million years ago. The Proterozoic was characterized by the formation of stable continents, the appearance of abundant bacteria and archaea, and the buildup of oxygen in the atmosphere. By about 1.8 billion years ago the oxygen buildup was significant enough to cause many types of bacteria to die out. At this time eukaryotes, including multicellular algae and the first animals, first appear in the fossil record. See Chart at geologic time.

单词	proterozoic
释义	Proterozoic [ prot-er-uh-zoh-ik, proh-ter- ] / ˌprɒt ər əˈzoʊ ɪk, ˌproʊ tər- / Geology adjective noting or pertaining to the latter half of the Precambrian Era, from about 2.5 billion to 570 million years ago, characterized by the appearance of bacteria and marine algae; Algonkian. noun the Proterozoic division of geologic time or the rock systems formed then; Algonkian. Origin of Proterozoic First recorded in 1905–10; protero- + zo- + -ic Words nearby Proterozoic proteometabolism, proteomics, proteose, protero-, proterotype, Proterozoic, protest, Protestant, Protestant Episcopal Church, Protestant Episcopal Church in the United States, Protestant ethic Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 Example sentences from the Web for Proterozoic Similar forms are abundant in late Proterozoic strata of Montana. Geology\|William J. Miller In regard to abundance of fossil animals the oldest (Cambrian) Paleozoic strata stand out in marked contrast to the Proterozoic. Geology\|William J. Miller The later Proterozoic strata have been much less deformed and in many cases they are practically unaltered. Geology\|William J. Miller Hence, uplift alone cannot account for extensive glaciation in subtropical latitudes during the Permian and Proterozoic. Climatic Changes\|Ellsworth Huntington This second series of rocks is called the Proterozoic (beginning of life) series, and marks a long age in the worlds history. The Outline of History: Being a Plain History of Life and Mankind\|Herbert George Wells British Dictionary definitions for Proterozoic Proterozoic / (ˌprəʊtərəʊˈzəʊɪk) / noun the later of two divisions of the Precambrian era, during which the earliest plants and animals are assumed to have livedCompare Archaeozoic adjective of or formed in the late Precambrian era 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 Proterozoic Proterozoic [ prŏt′ər-ə-zō′ĭk ] The later of the two divisions of the Precambrian Eon, from about 2.5 billion to 540 million years ago. The Proterozoic was characterized by the formation of stable continents, the appearance of abundant bacteria and archaea, and the buildup of oxygen in the atmosphere. By about 1.8 billion years ago the oxygen buildup was significant enough to cause many types of bacteria to die out. At this time eukaryotes, including multicellular algae and the first animals, first appear in the fossil record. 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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