[uh-see-tik, uh-set-ik]
pertaining to, derived from, or producing vinegar or acetic acid.

1800–10; acet- + -ic

semiacetic, adjective
unacetic, adjective

acetic, aesthetic, ascetic. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
acetic (əˈsiːtɪk, əˈsɛt-)
of, containing, producing, or derived from acetic acid or vinegar
[C19: from Latin acētum vinegar]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1808, from Fr. acétique "pertaining to vinegar," from L. acetum "vinegar" (properly vinum acetum "wine turned sour;" see vinegar), originally pp. of acere "be sour," related to acer "sharp" (see acrid).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
acetic   (ə-sē'tĭk)  Pronunciation Key 
Relating to or containing acetic acid or vinegar.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
It's home to a type of acetic acid-producing bacteria called acetobacter, which
  will convert your wine to vinegar.
They used acetic acid to dissolve the limestone, which leaves behind a residue
  of fossils preserved by calcium phosphate minerals.
Common wine defect caused by excess production of acetic acid, resulting in a
  vinegary smell.
When cellulose reacts with acetic acid to form the material, some acetic acid
  isn't used up.
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