单词	LD50
释义	LD50 noun ˌel-ˌdē-ˈfif-tē  : the amount of a toxic agent (such as a poison, virus, or radiation) that is sufficient to kill 50 percent of a population of animals usually within a certain time Word History Etymology lethal dose First Known Use 1942, in the meaning defined above Medical Definition LD50 noun variants or LD50 ˈel-ˈdē-ˈfif-tē  : the amount of a toxic agent (as a poison, virus, or radiation) that is sufficient to kill 50 percent of a population of animals usually within a certain time called also median lethal dose
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