retardation : Preferential retention of contaminant movement in the subsurface resulting from adsorptive processes or solubility differences.
Retardation, Retard: Retention of certain contaminants in the subsurface due to one or more physical, chemical, or biological factors. Also known as attenuation.
epoch Angular retardation of the maximum of a constituent of the observed tide (or tidal current) behind the corresponding maximum of the same constituent of the theoretical equilibrium tide. Also known as phase lag.
"In other places children's asthma rates are measured above 90 percent, or mental retardation is endemic. In these places, life expectancy may be half that of the richest nations.
(c) 10% or greater retardation of body weight gain as compared with control animals.
Note 2: In some studies, toxicity that could interfere with a carcinogenic effect is specifically excluded from consideration.
 See also: Waste, Reduce, Environment, Water, Site
  
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