Synonyms: Proterozoic, Proterozoic aeon, Proterozoic eon
Definition: from 2,500 to 544 million years ago; bacteria and fungi; primitive multicellular organisms
Synonyms: proterozoic
Definition: formed in the later of two divisions of the Precambrian era
Usage: proterozoic life forms
Similar words: early
Definition: at or near the beginning of a period of time or course of events or before the usual or expected time
Usage: early morning; an early warning; early diagnosis; an early death; took early retirement; an early spring; early varieties of peas and tomatoes mature before most standard varieties