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
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
In addition to fentanyl, toxicology tests detected alprazolam, commonly known as Xanax; the muscle relaxant methocarbamol; and quetiapine, a medication primarily used to treat schizophrenia, bipolar disorder, and, in some cases, depression. — Nancy Dillon, Rolling Stone, 8 Oct. 2026 Other cases require toxicology testing to determine whether drugs or other substances may have been a factor. — Dillon Thomas, CBS News, 7 Oct. 2026 An autopsy and toxicology report found Whittmore was under the influence of methamphetamine at the time of the collision. — Darrell Smith, Sacbee.com, 6 Oct. 2026 The compounds have not been confirmed to have caused or contributed to the deaths, as the autopsies and toxicology reports have not yet been released. — Kristen Rogers, CNN Money, 3 Oct. 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

Browse Nearby Words

Cite this Entry

“Toxicology.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/toxicology. Accessed 9 Oct. 2026.

Medical Definition

toxicology

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

More from Merriam-Webster on toxicology

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!