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

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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 and bipolar disorder and, in some cases, depression. — Nancy Dillon, Rolling Stone, 28 Sep. 2026 This is a foundational principle of toxicology originally written by the Swiss physician and chemist Paracelsus in 1538. — Sean McCann, The Conversation, 28 Sep. 2026 The official cause and manner of death are pending autopsy and toxicology results. — Garrett Behanna, CBS News, 28 Sep. 2026 The coroner's office said their names aren't being released yet and noted that toxicology reports are pending and could take weeks. — Adam Sabes , Kelsie Cairns, FOXNews.com, 24 Sep. 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 4 Oct. 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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