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http://en.wikipedia.org/wiki/LD50For other uses, see LD50 (disambiguation).
An LD50 test being administered
In toxicology, the LD50 (abbreviation for "Lethal Dose, 50%") or median lethal dose of a poison or radiation is the dose required to kill half the members of a tested population. LD50 figures are frequently used as a general indicator of a substance's toxicity. The test was created by J.W. Trevan in 1927.<1>
The term semilethal dose is occasionally used with the same meaning, particularly in translations from non-English-language texts, but can also refer to a sublethal dose; because of this ambiguity, it should generally be avoided.
MeSH (ID D007928) defines LD50 as:
The dose amount of poisonous or toxic substance or dose of ionizing radiation required to kill 50% of the tested population. Year introduced: 1976(1971).