Azoic


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Related to Azoic: Azoic Age

Azoic

[ā′zō·ik]
(geology)
That portion of the earlier Precambrian time in which there is no trace of life.
References in periodicals archive ?
The lack of light, the extremely high pressure even at moderate depths (hydrostatic pressure increases by 1 atmosphere with every 33 ft [10 m] depth) and the predictable lack of food due to the absence of primary producers, led the English naturalist Edward Forbes to formulate the azoic theory at the middle of the last century.
The Ministry of Environment and Forests is imposing a ban on the manufacture in India of the 190 prohibited dyes, including 84 direct dyes, 30 acid dyes, 16 disperse dyes, 11 basic dyes, 11 azoic dyes and 38 pigments.
Since the oyster shell used in this study was azoic, it is likely that megalopae were responding more to a tactile stimulus (physical and hydrodynamic) rather than a chemical one in their choice of shell over mud.
Most important are sulfonic acid derivatives of azoic dyes.
But with the advent of garment processing, denim is dyed in full spectrum of colours with reactive, vat, sulphur, pigment and azoic colours.