Etymology
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Words related to acetaminophen

acetic (adj.)
1808 (in acetic acid), from French acétique "pertaining to vinegar, sour, having the properties of vinegar," from Latin acetum "vinegar" (properly vinum acetum "wine turned sour;" see vinegar), originally past participle of acere "be sharp; be sour" (related to acer "sharp"), from PIE *ak-eto-, suffixed form of root *ak- "be sharp, rise (out) to a point, pierce."
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acetylene (n.)

gaseous hydrocarbon, 1860, from French acétylène, coined by French chemist Pierre Eugène Marcellin Berthelot from chemical ending -ene + acetyl, which was coined from acetic + -yl in 1839 by German chemist Justus von Liebig. Liebig's coinage was in reference to a different radical; acetyl was transferred to its current sense in 1850s, but Berthelot's coinage was based on the original use of acetyl.

amino- 
1887 as an element in compound words in chemistry, from combining form of amine. Amino acid is attested from 1898.
phenol (n.)

"carbolic acid, hydroxyl derivative of benzene," 1844, from pheno- + -ol. Discovered in coal tar in 1834; used as an antiseptic from 1867. Related: Phenolic.