1. 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-.

Origin of aceto-

< Latin acēt(um) vinegar + -o-. Cf. acid, acescent Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for aceto-


before a vowel acet-

combining form
  1. containing an acetyl group or derived from acetic acidacetone

Word Origin for aceto-

from Latin acētum vinegar
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for aceto-

before vowels acet-, word-forming element from comb. form of acetic and generally indicating compounds from or related to acetic acid.

Online Etymology Dictionary, © 2010 Douglas Harper

aceto- in Medicine


  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.