a·ce·ta·min·o·phen

[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.

Origin:
1955–60; acet- + amino- + phen(ol)

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Etymonline
Word Origin & History

acetaminophen
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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00:10
Acetaminophen has a plethora of syllables.
So is floccinaucinihilipilification. Does it mean:
the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language).
an obscure term ostensibly referring to a lung disease caused by silica dust, sometimes cited as one of the longest words in the English language.
American Heritage
Medical Dictionary

acetaminophen a·cet·a·min·o·phen (ə-sē'tə-mĭn'ə-fən, ās'ə-)
n.
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
Patients may get combinations of narcotic pain relievers and acetaminophen for
  periodic pain.
Fever and aches can be treated with acetaminophen or ibuprofen.
There's no harm in treating a true fever with over-the-counter acetaminophen or
  ibuprofen.
Aspirin may irritate the stomach and alcohol can amplify the toxic effects of
  acetaminophen on the liver.
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