archaean

/ (ɑːˈkɪən) /

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

QUIZZES

THE OCTOBER WORD OF THE DAY QUIZ IS HERE TO HAUNT YOU

Search your capacious memory for the meaning of October’s words!
Question 1 of 9
Which Word of the Day from this month means, “an irrational dislike; loathing”?

British Dictionary definitions for archaean (2 of 2)

Archaean

esp US Archean

/ (ɑːˈkiːən) /

adjective

of or relating to the highly metamorphosed rocks formed in the early Precambrian era
the earlier of two divisions of the Precambrian era, during which the earliest forms of life are assumed to have appeared
Compare Proterozoic
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example sentences from the Web for archaean

Scientific definitions for archaean

Archaean
[ är-kēən ]

Another spelling of Archean.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.