LD50
noun
variants
or LD50
: 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
Cite this Entry
“LD50.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/LD50. Accessed 7 Jul. 2026.
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