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In a data set, the value that half the data points fall below and half the data points fall above. It is used along with the mean; it is not as influenced by extreme values as the mean.
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The middle number of a series. See also mean, which includes examples.

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References in periodicals archive ?
Based on the exploratory experiments, narrow ranges were administered to the experimental shrimp to determine the median lethal dose ([LD.sub.50]).
Colony survival assays of the 291.03C cells demonstrate a median lethal concentration (L[C.sub.50]) of arsenite of 0.9 [micro]M and a median lethal dose (L[D.sub.50]) of UVR of 0.05 kJ/[m.sup.2].
phalloides poisoning is 20%-30% (1,2,4), and the median lethal dose is 0.1 mg to 0.3 mg of the toxin per kg of body weight (1,5).