Definition of Priscoan in English:

Priscoan

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. 1.1The Priscoan eon.

Origin

Formed irregularly from Latin priscus ancient + -an.

Pronunciation:

Priscoan

/prisˈkōən/