median lethal dose

median lethal dose

noun
the quantity of a lethal substance, as a poison or pathogen, or of ionizing radiation that will kill 50 percent of the organisms subjected to it in a specified time period. Symbol: LD 5 0

Origin:
1945–50

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World English Dictionary
median lethal dose or mean lethal dose
 
n
1.  the amount of a drug or other substance that, when administered to a group of experimental animals, will kill 50 per cent of the group in a specified time
2.  the amount of ionizing radiation that will kill 50 per cent of a population in a specified time
 
mean lethal dose or mean lethal dose
 
n

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