archean

English Thesaurus

1. the time from 3,800 million years to 2,500 million years ago; earth's crust formed; unicellular organisms are earliest forms of life (noun.time)

instance hypernym	:	aeon, eon,
definition	:	the longest division of geological time (noun.time)

part meronym	:	precambrian, precambrian aeon, precambrian eon, precambrian period,
definition	:	the eon following the Hadean time and preceding the Phanerozoic eon; from about 3,800 million years ago until 544 million years ago (noun.time)

2. of or relating to the earliest known rocks formed during the Precambrian Eon (adj.all)

similar	:	early,
definition	:	at or near the beginning of a period of time or course of events or before the usual or expected time (adj.all)

domain category	:	geology,
definition	:	a science that deals with the history of the earth as recorded in rocks (noun.cognition)

3. the time from 3,800 million years to 2,500 million years ago; earth's crust formed; unicellular organisms are earliest forms of life (noun.time)

derivation	:	archaean, archean,
definition	:	of or relating to the earliest known rocks formed during the Precambrian Eon (adj.all)

derivation	:	archaeozoic, archeozoic,
definition	:	of or belonging to earlier of two divisions of the Precambrian era (adj.all)

4. of or relating to the earliest known rocks formed during the Precambrian Eon (adj.all)

derivation	:	archaeozoic, archaeozoic aeon, archean, archean aeon, archean eon, archeozoic, archeozoic eon,
definition	:	the time from 3,800 million years to 2,500 million years ago; earth's crust formed; unicellular organisms are earliest forms of life (noun.time)

5. the time from 3,800 million years to 2,500 million years ago; earth's crust formed; unicellular organisms are earliest forms of life (noun.time)

derivation	:	archaean, archean,
definition	:	of or relating to the earliest known rocks formed during the Precambrian Eon (adj.all)

derivation	:	archaeozoic, archeozoic,
definition	:	of or belonging to earlier of two divisions of the Precambrian era (adj.all)

6. of or relating to the earliest known rocks formed during the Precambrian Eon (adj.all)

derivation	:	archaeozoic, archaeozoic aeon, archean, archean aeon, archean eon, archeozoic, archeozoic eon,
definition	:	the time from 3,800 million years to 2,500 million years ago; earth's crust formed; unicellular organisms are earliest forms of life (noun.time)