learned something new today. Which wasn't a sure thing.
"What does LD50 mean?
LD stands for "Lethal Dose". LD50 is the amount of a material, given all at once, which causes the death of 50% (one half) of a group of test animals. The LD50 is one way to measure the short-term poisoning potential (acute toxicity) of a material."
jargon watchers make note. Fifty american cents for ID'ing the source of this knowledge, and I don't mean the link above.