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acetaminophen

American  
[uh-see-tuh-min-uh-fuhn] / əˌsi təˈmɪn ə fən /

noun

Pharmacology.

  1. a crystalline substance, C 8 H 9 NO 2 , used as a headache and pain reliever and to reduce fever.

acetaminophen Scientific  
/ ə-sē′tə-mĭn′ə-fən,ăs′ə- /

  1. A crystalline compound used in medicine to relieve pain and reduce fever. Chemical formula: C 8 H 9 NO 2.

Etymology

Origin of acetaminophen

First recorded in 1955–60; acet- + amino- + phen(ol)

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Some previous studies have indicated risks of acetaminophen to fetal development, but others have found no link, the Journal has reported.

From The Wall Street Journal • Mar. 10, 2026

Could his trouble pronouncing acetaminophen be a phonemic paraphasic error?

From Slate • Jan. 26, 2026

The American College of Obstetricians and Gynecologists says acetaminophen is safe to use during pregnancy.

From The Wall Street Journal • Jan. 26, 2026

The analysis was prompted by renewed public concern following claims made in September 2025 suggesting that prenatal exposure to acetaminophen could interfere with brain development and increase the likelihood of autism.

From Science Daily • Jan. 19, 2026

This evidence supports the continued use of acetaminophen as a safe option when taken as directed.

From Science Daily • Jan. 19, 2026

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.