%eozoic%

n. [ Gr. 'archai^os ancient + zw^, on animal. ] the time from 1.5 billion to 5 billion years ago; the time when the earth's crust formed; a time when only unicellular organisms and the earliest forms of life are present.
Syn. -- Archeozoic, Archeozoic era, Archaeozoic era [ WordNet 1.5 ]

n. 1. 1 the time from 1.5 billion to 5 billion years ago, when the earth's crust was formed; the time when only unicellular organisms and the earliest forms of life are present. Same as Archaeozoic.
Syn. -- Archaeozoic, Archeozoic era, Archaeozoic era [ WordNet 1.5 ]

adj. 1. 1 (Geol.) same as archaeozoic.
Syn. -- archaeozoic [ WordNet 1.5 ]

a. [ See Eozoön. ] (Geol.) Of or pertaining to rocks or strata older than the Paleozoic, in many of which the eozoön has been found. [ 1913 Webster ]

☞ This term has been proposed for the strata formerly called Azoic, and is preferred especially by those geologists who regard the eozoön as of organic origin. See Archæan. [ 1913 Webster ]

a. [ Gr. &unr_; like + &unr_; life. ] (Zool.) Pertaining to, or including, similar forms or kinds of life; as, homœozoic belts on the earth's surface. E. Forbes. [ 1913 Webster ]

a. [ Neo- + Gr. &unr_; life. ] (Geol.) More recent than the Paleozoic, -- that is, including the Mesozoic and Cenozoic. [ 1913 Webster ]

a. [ Paleo- + Gr. zwh` life, fr. zh^n to live. ] (Geol.) Of or pertaining to, or designating, the older division of geological time during which life is known to have existed, including the Silurian, Devonian, and Carboniferous ages, and also to the life or rocks of those ages. See Chart of Geology. [ 1913 Webster ]

n. (Geol.) The Paleozoic time or strata. [ 1913 Webster ]