a combining form with the meanings “vinegar,” “acetic acid,” used in the formation of compound words (acetometer ), especially in the names of chemical compounds in which acetic acid or the acetyl group is present (acetophenetidin ).
Also, especially before a vowel, acet-.

< Latin acēt(um) vinegar + -o-. Cf. acid, acescent Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
aceto- or (before a vowel) acet-
combining form
containing an acetyl group or derived from acetic acid: acetone
[from Latin acētum vinegar]
acet- or (before a vowel) acet-
combining form
[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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American Heritage
Medical Dictionary

aceto- or acet-

  1. Acetic acid: acetaldehyde.

  2. Acetyl: acetanilide.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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