Definitions for "LETHAL DOSE 50"
A single dose of a material expected to kill 50 percent of a group of test animals.
The dose of a substance or chemical that will kill 50% of the test animals in a group within the first 30 days follwoing exposure.
The dose that is just lethal or deadly to 50% of the specimen. This terminology is used in biological experiments. It is the same as the median lethal dose or the median.