lethal dose

lethal dose
(LD)
   a measure used in pharmacology to express the percentage of a population killed by a dose of the substance being studied. The measurement is often given as a subscript. For example, the potency of a drug or pesticide is commonly expressed by stating the size of the LD50 dose: the amount of the substance that kills 50% of the test population.

Dictionary of units of measurement. 2015.

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  • lethal dose — the amount of an agent, such as a toxin or radiation, that will or may be sufficient to cause death. See also median lethal d. and minimum lethal d. Called also fatal d. Cf. L+ d …   Medical dictionary

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  • lethal dose 50 — (LD50) Refers to the dose or number of organisms that will kill 50% of an experimental group of hosts within a specified time period …   Dictionary of microbiology

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