Noun
acute toxicity (countable and uncountable, plural acute toxicities)
The ability of a substance to cause harmful effects soon after a single exposure or dose.
Acute toxicity DDT is classified as "moderately toxic" by the US National Toxicology Program (NTP) citation and "moderately hazardous" by WHO, based on the rat oral LD 50 of 113 mg/kg. Source: Internet