toxicity

noun

tox·​ic·​i·​ty täk-ˈsi-sə-tē How to pronounce toxicity (audio)
plural toxicities
: the quality or state of being toxic: such as
a
: the quality, state, or relative degree of being poisonous
measuring the toxicity level of the soil
The toxicity of some chemical agents degrades significantly over time, so it is unclear how lethal the stockpiles are.David S. Cloud
Administering a cocktail of drugs would dilute the toxicities of the different drugs and minimize the development of viral resistance to them.Rudy M. Baum and Ron Dagani
b
: an extremely harsh, malicious, or harmful quality
In the past few days, I've tuned in to C-SPAN to watch a number of the televised Senate debates, which illustrate all too vividly the toxicity of an uncivil tongue.Connie Schultz
In much of the ensuing commentary, court watchers worried that the justices' soaring rates of written dissents, nasty and personal attacks and scathing remarks read aloud from the bench bespeak a new toxicity in Supreme Court discourse.Dahlia Lithwick

Did you know?

Toxicity is often a relative thing; in the words of a famous old saying, "The dose makes the poison". Thus, it's possible to die from drinking too much water, and lives have been saved by tiny doses of arsenic. Even though botulinum toxin is the most toxic substance known, it's the basic ingredient in Botox, which is injected into the face to get rid of wrinkles. With some poisons, mere skin contact can be lethal; others are lethal when breathed into the lungs in microscopic amounts. To determine if a chemical will be officially called a poison, researchers often use the "LD50" test: If 50 milligrams of the substance for every kilogram of an animal's body weight results in the death of 50% of test animals, the chemical is a poison. But there are problems with such tests, and toxicity remains a very individual concept.

Examples of toxicity in a Sentence

Recent Examples on the Web The toxicity of the chemical led the EPA to ban its sale as a paint stripper in 2019; in 2023 the agency proposed a ban of its sale for other consumer uses and many industrial and commercial uses, Doa said. Cnn.com Wire Service, The Mercury News, 17 Apr. 2024 In 2017, the Google unit released Perspective API, an algorithm for detecting toxicity. Billy Perrigo, TIME, 15 Apr. 2024 Environmental lawyer Robert Bilott was among the first people to bring national attention to PFAS toxicity. Claire Bugos, Verywell Health, 12 Apr. 2024 An autopsy report concluded that Kaspar died of an accident involving bupivacaine toxicity and the nerve-blocking agent was found in her bloodstream. Nicole Lopez, Fort Worth Star-Telegram, 12 Apr. 2024 The way our generation is… all this toxicity going on and everybody just f—king everybody. Kyle Denis, Billboard, 5 Apr. 2024 As for Europe’s own political toxicity, David isn’t feeling anywhere near as anxious as events in the U.S. have made him. Ryan Hogg, Fortune Europe, 20 Mar. 2024 Addressing the keynote panel at the opening day of the 2024 SXSW conference, the Duchess of Sussex addressed online toxicity that had been directed toward her. Lachlan Cartwright, The Hollywood Reporter, 8 Mar. 2024 Testing your water supply for toxicity can be expensive for most people. Claire Bugos, Verywell Health, 12 Apr. 2024

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'toxicity.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

First Known Use

1879, in the meaning defined above

Time Traveler
The first known use of toxicity was in 1879

Dictionary Entries Near toxicity

Cite this Entry

“Toxicity.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/toxicity. Accessed 2 May. 2024.

Medical Definition

toxicity

noun
tox·​ic·​i·​ty täk-ˈsis-ət-ē How to pronounce toxicity (audio)
plural toxicities
: the quality, state, or relative degree of being toxic or poisonous

More from Merriam-Webster on toxicity

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