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(formerly) noting or pertaining to the precambrian era, especially that part formerly believed to precede the first appearance of life; archean.
of, relating to, or characteristic of the azo group.
historical examples

there are traces of periods of superabundant ice and snow, of “glacial ages,” that is, even in the azoic period.
a short history of the world h. g. wells

the oldest lands of north america were built up, as in europe, of azoic rocks, and were grouped chiefly in the north.
fragments of earth lore james geikie

thus the azoic group is crystalliferous, or crystal-bearing.
the religion of geology and its connected sciences edward hitchc-ck

distinct fossils have not been found, all that ever existed in the azoic rocks having been obliterated.
the origin of the world according to revelation and science john william dawson

the earliest rocks in the record are called by geologists the azoic rocks, because they show no traces of life.
a short history of the world h. g. wells

geologists have divided a few years of the worlds history into periods, reaching from the azoic rocks to the soil of our time.
the works of robert g. ingersoll, vol. 4 (of 12) robert g. ingersoll

that land belongs to the azoic period, and contains no trace of life.
the atlantic monthly, vol. ix., march, 1862., no. liii. various

the tertiary formation is followed by an azoic formation of gneiss, mica slate, and phylada with large intrusions of granite.
guatemala, the country of the future charles m. pepper

in the european ocean of the azoic epoch we find five islands of considerable size.
atlantic monthly, vol. xii. july, 1863, no. lxix. various

now, most of these canadian rivers are azoic in character; hence their grim and formidable beauty.
crowded out! and other sketches susie f. harrison

adjective
without life; characteristic of the ages that have left no evidence of life in the form of organic remains
adj.

1854, with -ic + greek azoos, from a- “not, without” (see a- (3)) + zoon “animal” (see zoo).

azoic a·zo·ic (ā-zō’ĭk)
adj.
containing no living things; lacking organic life.