no observable effect

no observable effect

Environment adjective Referring to a lack of observable changes associated with a potentially dangerous or toxic chemical. See Bounty hunter provision, No significant risk, Proposition 65.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
(2002) was termed a no observable effect level (NOEL) by the National Research Council (NRC 2005).
An addition of a eutectic modifier had no observable effect on the X-ray rating.
Even the fact that the Rota overturned over 90% of the appeals made to it from the United States has had no observable effect.
The next lower dose of chlordecone tested, 0.1 mg per pellet (or about 0.04 mg/kg/day), might be considered a no observable effect level (NOEL) from this experiment.