Dictionary.com
definitions

ach

[ahkh]
interjection German.
  1. alas; oh.

ACH

  1. automated clearinghouse.

ACh

Biochemistry.
  1. acetylcholine.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for ach

Historical Examples of ach

  • "Ach, no," said he humbly; for he could not look upon my face and hold his anger.

  • "Ach, Frulein, please do not leave us—and the fire," he added; for Dorothy had risen.

    Roden's Corner

    Henry Seton Merriman

  • Mrs. Hermann would glance at me quickly, emit slight "Ach's!"

    Falk

    Joseph Conrad

  • "Ach, no," chimed in husband and wife together as soon as they understood.

    Brother Copas

    Sir Arthur Thomas Quiller-Couch

  • Now, if you will follow me a few paces to ze right, here… Ach!

    Brother Copas

    Sir Arthur Thomas Quiller-Couch

British Dictionary definitions for ach

ach

interjection
  1. Scot an expression of surprise, impatience, disgust, etcAlso: och
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 ach
interj.

aspirated form of ah; in English often used to represent German or Celtic speech.

Online Etymology Dictionary, © 2010 Douglas Harper
ach in Medicine

Ach

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