toxicology

noun

: a science that deals with poisons and their effect and with the problems involved (such as clinical, industrial, or legal problems)

Did you know?

Even though most of us are aware of toxicology primarily from crime shows on TV, toxicologists actually do most of their work in other fields. Many are employed by drug companies, others by chemical companies. Many work for the government, making sure the public is being kept safe from environmental poisons in the water, soil, and air, as well as unhealthy substances in our food and drugs. These issues often have to do with quantity; questions about how much of some substance should be considered dangerous, whether in the air or in a soft drink, may be left to toxicologists. But occasionally a toxicology task may be more exciting: for instance, discovering that what looked like an ordinary heart attack was actually brought on by a hypodermic injection of a paralyzing muscle relaxant.

Examples of toxicology in a Sentence

Recent Examples on the Web
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In both cases, the pathologists have waited for the results of toxicology tests, which can take weeks to complete. Dalia Faheid, CNN Money, 21 Aug. 2026 The autopsy has already been completed, but authorities are waiting on toxicology findings to determine the cause and manner of her death. Allison Degrushe, StyleCaster, 21 Aug. 2026 Authorities are waiting the results of a toxicology test to determine Panettiere’s cause of death. Brian Niemietz, New York Daily News, 20 Aug. 2026 Hayden Panettiere toxicology report An official autopsy or toxicology report on Panettiere's death has not been released. Edward Segarra, USA Today, 20 Aug. 2026 See All Example Sentences for toxicology

Word History

First Known Use

1799, in the meaning defined above

Time Traveler
The first known use of toxicology was in 1799

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Cite this Entry

“Toxicology.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/toxicology. Accessed 24 Aug. 2026.

Medical Definition

toxicology

noun
plural toxicologies
: the scientific study of the adverse effects of chemical substances on the living organism

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