Go to MSN Homeencarta®
Dictionary
Find
in
Dictionary
Thesaurus
Translations
ABCDEFGHIJKLMNOPQRSTUVWXYZ
Click to move up the list of words
hacksaw
hacktivism
hackwork
had
hadaway
haddock
hade
Hadean
Hadean eon
Hades
Hadhramaut
Hadith
hadj
hadn’t
Hadramaut
Hadrian’s Wall
hadron
Click to move down the list of words
Also available:

World English Dictionary
Dictionnaire Français

Hadean eon
Had·e·an e·on


noun 
Definition:
 
unit of geologic time: the period of geologic time not confirmed by rock formation records, beginning approximately 4.6 billion years ago with the formation of the Earth
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
Advertisement
© 2009 Microsoft