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- The lowest non-zero dose of a chemical at which a specified measurable effect occurs. Sometimes used to refer to the income level above which an applicant for food stamp benefits would be ineligible.
- minimum amount of stimulation that obtains a response
Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby
- (1) The lowest dose of a chemical at which a specified measurable effect is observed and below which it is not observed. (2) The dose or exposure level below which a significant adverse effect is not expected.
Source: Terms of the Environment