adj, name ·Rare ·Advanced level

Definitions

Adjective

1. 1
   Of a geologic era within the Archaean eon from about 3600 to 3200 million years ago; the first aerobic bacteria appeared at this time. not-comparable

Proper Noun

1. 1
   The era from 3,600 Ma to 3,200 Ma.

Synonyms

All synonyms

eoarchean

Etymology

From paleo- + Archaean.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.