What does Ah stand for?

Ahikar (BJA)

Ahilot (BJA)

Ampere Hour (IDOE)

Agricultural Homestead (SAUS)

Ampere-Hour (NTIO)

Himalaya Mountain Region - MARC geographic area code - Library of Congress (LCCP)

Abdominal Herniorrhaphy - Medicine (MELL)

Abdominal Hysterectomy - Medicine

Absolute Humidity (MELL)

Absorptive Hypercalciuria - Medicine (DMAA)

Academy of Homiletics (EA)

Accelerated Hypertension - Medicine

Acceptor Handshake (MHDI)

Access for the Handicapped - Defunct (EA)

Access Hole (SAUS)

Accidental Hypothermia - Medicine

Accumulator High - Computer science

Acetohexamide - Pharmacology (DAVI)

Acid Hematine (SAUS)

Active Homing (SAUS)

Actual Hours (SAUS)

Acute Hepatitis - Medicine (DB)

Add Halfword (SAUS)

Adenomatous Hyperplasia - Medicine

Adie-Holmes - Syndrome - Medicine (DB)

Admiralty House (SAUO)

Adult Heart

After Hatch - Shipping

After Hours (ADA)

After Hours - Electric utility company

After-Hyperpolarization - Also, AHP - Neurophysiology

Agriculture Handbook

Agudas Harabonim - Union of Orthodox Rabbis of the United States and Canada

Air Algerie - ICAO designator (AD)

Aircraft Handler - British

Air-Cushion Vehicle built by Ajax Hovercraft - England - Usually used in combination with numerals

Airfield Heliport

Air-Hardened (SAUS)

Air Headquarters (SAUO)

Air Heater (CARB)

Air History (SAUS)

Airline Hostess (SAUS)

Alan Hutchison Publishing Ltd. - British

Alaska Hydro Train - Federal Railroad Administration identification code

Alcoholic Hepatitis - Medicine

Alfred Holt - Blue Funnel Line - Steamship (MHDB)

Alice Heim - Psychology (WDAA)

Allen & Hanburys - Great Britain - Research code symbol

Allen Head (SAUS)

Allied Health Program - Association of Independent Colleges and Schools specialization code

Allis-Chalmers Corp. (SAUO)

Allowance Holder - Environmental Protection Agency (GFGA)

Alter Heading - Navigation

Alternate Headquarters - Military (NVT)

Alveolar Hemorrhage - Medicine (MELL)

Amenorrhea and Hirsutism - Endocrinology (MAE)

American-Hawaian Steamship Company (SAUO)

American Health (SAUS)

American Hebrew (BJA)

American Heritage - A publication (BRI)

American Home Products Corp. (EFIS)

American Horizons - Defunct (EA)

American Humane - Formerly American Humane Association

American Humanics (EA)

American Hunter

Aminohippurate (MAE)

Analog Hybrid (OA)

Anhydrous Hydrazine - Rocket propellant

Animal Husbandry (SAUS)

Animal Husbandry Research Division - of ARS, Department of Agriculture

Anno Hebraico - In the Hebrew Year - Since 3761 BC - Latin

Anno Hegirae - In the Year of the Hegira - The flight of Mohammed from Mecca - AD 622 - Latin

Annunciator Horn (SAUS)

Anterior Hypothalamic Nucleus - Brain anatomy

Anterior Hypothalamus - Medicine (DB)

Antihalation

Antihunt - Circuit - Electronics

Antihyaluronidase - Clinical chemistry

Apache Helicopter - Anti-armor attack helicopter

Aqueous Humor - Anatomy (CPH)

Arcuate Hypothalamus - Medicine (DB)

Armor Holdings - NYSE symbol (SPSG)

Army Helicopter - British military (DMA)

Army Hospital

Arterial Hypertension - Medicine

Artificial Heart - Medicine

Artificial Horizon (MCD)

Arts and Humanities

Ascites Hepatoma - Medicine

Ashmore and Cartier Islands - NCIC country-territory code (NCIC)

Asia House - An association (EA)

Association of Headmistresses - British (DI)

Association of Hispanists - British

Astigmatism, Hypermetropic - Also, AsH - Ophthalmology

At Home

Atrial His-Bundle - Cardiology

Attack Heavy (DNAB)

Attack Helicopter (CINC)

Attention Handling (SAUS)

Attitude Hold (MCD)

Auditory Hallucination - Medicine (IDYL)

Auger Hole (SAUS)

Authentication Header - Computer science

Automated Howitzer

Autonomic Hyperreflexia - Medicine

Available Hours - Electronics (IEEE)

Avalon Hill (SAUS)

Hinton Public Library, Alberta - Library symbol - National Library of Canada (NLC)

Hospital Ship - Navy symbol

Huntsville Public Library, Huntsville, AL - Library symbol - Library of Congress (LCLS)