# LD50

> English word · Noun

## Definitions
1. The amount of a substance required to kill half of a given population; a measure of toxicity.

## Etymology
Abbreviation of lethal dose 50%.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/ld50