Search Result for "proterozoic eon":
Wordnet 3.0

NOUN (1)

1. from 2,500 to 544 million years ago; bacteria and fungi; primitive multicellular organisms;
[syn: Proterozoic, Proterozoic eon, Proterozoic aeon]



WordNet (r) 3.0 (2006):

Proterozoic eon
    n 1: from 2,500 to 544 million years ago; bacteria and fungi;
         primitive multicellular organisms [syn: Proterozoic,
         Proterozoic eon, Proterozoic aeon]