Definition of Priscoan in English:

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Priscoan

Pronunciation: /prisˈkōən/

adjective

Geology
1Relating to or denoting the eon that (in some schemes) constitutes the earliest part of the Precambrian, preceding the Archean eon. It extended from the origin of the earth to about 4 billion years ago and has left no so far identifiable rocks.
1.1 (as noun the Priscoan) The Priscoan eon.

Origin

Formed irregularly from Latin priscus 'ancient' + -an.

For editors and proofreaders

Syllabification: Pris·co·an

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