What does "lethal dose" mean?

The dose of a substance or of radiation likely to cause death (sometimes suffixed with a number).

What is a synonym for "lethal dose"?

Common synonyms include: overdose.

noun

noun ·Rare ·Advanced level

Noun

1
The dose of a substance or of radiation likely to cause death (sometimes suffixed with a number).
"A lethal dose 50 will cause the death of 50% of a sample of test animals."
2
the size dose that will cause death wordnet

"A lethal dose 50 will cause the death of 50% of a sample of test animals."