What does Ach stand for?

Acetylchlorine (DIPS)

Acharius - Botanist in plant scientific name (HUH)

Acharnenses - Acharnians - of Aristophanes - Classical studies (OCD)

Achiasaph (BJA)

Acholi - MARC language code - Library of Congress (LCCP)

Actual Obtained Achievement (SAUS)

Accident Case Histories - Medicine (EDAA)

ACCS - Army Command and Control System Common Hardware - Military technology (DDF)

Acetone Cyanohydrin - Organic chemistry (PDAA)

Acetylcholine

Acetylcholinesterase - An enzyme (PDAA)

Acha Hermanos - NCIC firearms make code (NCIC)

Achalasia - Medicine (EDAA)

Achieve - Telegraphy (PCTE)

Achilles - NCIC boat manufacturer code (NCIC)

Achilles USA, Everett, WA - Manufacturer code for watercraft hull identification number (USCG)

Achondroplasia - Medicine

Achumawi - Language code (ETLW)

Acknowledge Hold - Computer science (IAA)

Acquisition Command Headquarters (AFIT)

Active Chronic Hepatitis - Medicine (DMAA)

Acute Care Hospital (MELL)

Adenal Cortical Hormone (SAUS)

Adrenal Cortical Hormone - Endocrinology

Adreno-Cortical Hormone (SAUS)

Advanced Chain Home - RADAR

Aerosolized Aluminium Chlorhydrate (DB)

Aftercoming Head - Obstetrics

Air Change per Hour - Ventilation and infiltration rates

Air Cleaner Housing - Automotive engineering

Aircrafthand - British

Aircraft Hangar (MCD)

Alexander Haagen Properties - AMEX symbol

Alexander Haagen Property, Inc. - AMEX symbol (SPSG)

Alternating Current Hum (SAUS)

Aluminium Chlorohydrate (SAUS)

Aluminum Chlorohydrate - Inorganic chemistry

American Center for Homeopathy (EA)

American College of Heraldry (EA)

Amyotrophic Cerebellar Hypoplasia - Medicine (DMAA)

Anglican Church Handbooks - A publication

Anton Chico, NM - Location identifier - FAA (FAAL)

Area Combined Headquarters - World War II (DMA)

Arm-Chest-Height (SAUS)

Arm/Chest Height - Medicine (DB)

Arm/Chest/Hip - Medicine (DB)

Arm Girth, Chest Depth, and Hip Width - Anatomical index

Associate Committee on Hydrology (FOTI)

Associate of the Chartered Insurance Institute (AD)

Association Canadienne des Hispanistes - Canadian Association of Hispanists - CAH

Association Canadienne des Humanites - Humanities Association of Canada - HAC

Association for Computers and/in the Humanities (SAUO)

Association for Computers and the Humanities (EA)

Association of California Hospitals (SAUO)

Association of Caribbean Historians - Nassau, Bahamas (EAIO)

Association of Comparative Haematology - British (DBA)

Association of Contemporary Historians (EA)

Association of Cosmetologists and Hairdressers (EA)

Attempt per Circuit per Hour (SAUS)

Attempts per Circuit per Hour - Telecommunications (TEL)

Autocorrelation Histogram - Statistics

Automated Clearinghouse - Banking

Automated (or Automatic) Clearing House (SAUO)

Automatic Cartridge Handler (SAUS)

Barcklay Flying Service - ICAO designator (FAAC)

Center Trust Retail Properties - Formerly, Alexander Haagen Properties - AMEX symbol

Home Oil Co. Ltd., Calgary, Alberta - Library symbol - National Library of Canada (NLC)