Definitions for "LC50"
Lethal Concentration 50% died of test animals. The concentration of a material which on the basis of laboratory tests is expected to kill 50 percent of a group of test animals when administered as a single exposure.
concentration having caused the death of 50% of the population tested compared to control
The concentration of toxicant necessary to kill 50 percent of the organisms being tested. It is usually expressed in parts per million (ppm).
Keywords:  employee, limited
Limited employee