HyperDic: priscoan_eon

English > 1 sense of the expression *Priscoan eon*:
NOUN	time	Priscoan eon, Hadean, Hadean time, Hadean eon, Hadean aeon, Priscoan, Priscoan aeon	the earliest eon in the history of the Earth from the first accretion of planetary material (around 4,600 million years ago) until the date of the oldest known rocks (about 3,800 million years ago)

English > *Priscoan eon*: 1 sense > noun 1, time
Meaning	The earliest eon in the history of the Earth from the first accretion of planetary material (around 4,600 million years ago) until the date of the oldest known rocks (about 3,800 million years ago); no evidence of life.
Synonyms	Hadean, Hadean time, Hadean eon, Hadean aeon, Priscoan, Priscoan aeon
Instance of	eon, aeon	The longest division of geological time