median lethal dose; LD50
Technical term used in toxicology and pharmacology; the dose of a substance that kills 50% of a test population.
The median lethal dose of this chemical substance is very low.
The LD50 is an important index for toxicity assessment.
致死量 is the general term for a fatal dose, while 半数致死量 (LD50) is the precise statistical dose that kills half of a test population.
Compound of 半数 (half the number), 致死 (lethal), and 量 (amount). The term is a direct translation of the English 'median lethal dose'.