Bible Dictionaries
Archaean

Webster's Dictionary

(1):

(a.) Ancient; pertaining to the earliest period in geological history.

(2):

(n.) The earliest period in geological period, extending up to the Lower Silurian. It includes an Azoic age, previous to the appearance of life, and an Eozoic age, including the earliest forms of life.

Bibliography Information
Webster, Noah. Entry for 'Archaean'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​a/archaean.html. 1828.