Definition of Priscoan in English:

Priscoan

Pronunciation /prisˈkōən/ /prɪsˈkoʊən/

adjective

Geology
  • Relating to or denoting the eon that (in some chronological arrangements) constitutes the earliest part of the Precambrian, preceding the Archean eon. It extended from the origin of the earth to about 4,000 million years ago, and has left no identifiable rocks.

    • ‘during the turbulent Priscoan era, heavy metallic elements sink down to become the inner core’

noun

Geology
  • the PriscoanThe eon that (in some chronological arrangements) constitutes the earliest part of the Precambrian, preceding the Archean eon.

    • ‘together, the Proterozoic, Archean, and Priscoan constitute what was formerly known as the Precambrian’

Origin

Formed irregularly from Latin priscus ‘ancient’+ -an.