[uh-see-tuh-min-uh-fuhn, as-i-tuh-]
noun Pharmacology.
a crystalline substance, C 8 H 9 NO 2 , used as a headache and pain reliever and to reduce fever.

1955–60; acet- + amino- + phen(ol) Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Word Origin & History

U.S. name for "para-acetylaminophenol," 1960, Amer.Eng., composed of syllables from the chemical name; in Britain, the same substance is paracetamol.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

acetaminophen a·cet·a·min·o·phen (ə-sē'tə-mĭn'ə-fən, ās'ə-)
A crystalline compound used in chemical synthesis and in medicine to relieve pain and reduce fevers.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
acetaminophen   (ə-sē'tə-mĭn'ə-fən, ās'ə-)  Pronunciation Key 
A crystalline compound used in medicine to relieve pain and reduce fever. Chemical formula: C8H9NO2.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Aspirin may irritate the stomach and alcohol can amplify the toxic effects of
  acetaminophen on the liver.
There are preliminary studies that are beginning to link acetaminophen use with
  both the rise of autism and asthma.
These can often be controlled by taking acetaminophen before or after
There's no harm in treating a true fever with over-the-counter acetaminophen or
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