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• Archaean
  Archaean

  adjective

  of or relating to the highly metamorphosed rocks formed in the early Precambrian era
• archaean
  archaean

  noun

  any member of the Archaea , a domain of prokaryotic microorganisms, distinguished from bacteria on molecular phylogenetic grounds and often found in hostile environments, such as volcanic vents and hot springs

Archaean

¹ British  

/ ɑːˈkiːən /

adjective

1. of or relating to the highly metamorphosed rocks formed in the early Precambrian era

2. the earlier of two divisions of the Precambrian era, during which the earliest forms of life are assumed to have appeared

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archaean ² British  

/ ɑːˈkɪən /

noun

1. any member of the Archaea , a domain of prokaryotic microorganisms, distinguished from bacteria on molecular phylogenetic grounds and often found in hostile environments, such as volcanic vents and hot springs

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Example Sentences

There are four different types of Archaean cell walls.

From Textbooks • Jun. 9, 2022

There is geological evidence that Earth’s oceans became salty early during the Archaean, and that at times in the past, they have been at least half again as salty as they are now.

From Textbooks • Jan. 1, 2015

This "palaeobarometry" approach, revealed at the , will help constrain the models that try to simulate conditions in Archaean times.

From BBC • Dec. 4, 2012

The team concluded that if the biggest imprints in the Ventersdorp rock were formed by the largest raindrops, air pressure in the Archaean could have been no more than twice what it is today.

From BBC • Dec. 4, 2012

Wenlock Edge, running from south-west to north-east, is an escarpment of Silurian limestone, while the broad upland of Long Mynd, nearly parallel to it on the north, is a mass of Archaean rock.

From Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 4 "England" to "English Finance" by Various