What does HD stand for?

Air-Conditioning Apparatus - JETDS nomenclature - Military (CET)

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

Distilled Mustard (SAUS)

Grand National Party (South Korea) - Political party (PSAP)

Haab-Dimmer - Syndrome - Medicine (DB)

Had - Telegraphy (PCTE)

Haglund Deformity - Medicine (MELL)

Hajna-Damon Broth - Medicine (DMAA)

Half Day (SAUS)

Half Duplex (ACAE)

Half-Duplex - Telecommunications (DCDG)

Half Duplex Transmission - Data communication (CET)

Hamming-Distance (SAUS)

Hand (ROG)

Hand-Drawn

Handover (SAUS)

Hanford Decommissioning (SAUS)

Hank's Dilator - Medicine (MELL)

Hanmonic Distortion (SAUS)

Hansen's Disease - Leprosy - Medicine

Harassment Drone (SAUS)

Harbor Defense - Military

Harbor Drive (SAUS)

Harbour Defence (SAUS)

Hard (MSA)

Hard Disk - Computer science

Hard Disk High Density (SAUS)

Hard Drawn (SAUS)

Hard-Drawn - Metallurgy

Hard Drive (GOBB)

Hardware Design

Hardwood (ADWA)

Harley-Davidson - NCIC motorcycle make code

Harmonic Definition (SAUS)

Harmonic Distortion

Harmonic Distortion Head (SAUS)

Harmonisation Document (SAUS)

Harmonization Document (CENE)

Harmonized Document (JAGO)

Hartnup Disease - Medicine (MELL)

Hawaiian Department - Army - World War II

Head (AAG)

Head Diameter

Head Driver (IAA)

Headed (SAUS)

Heading

Heading to Detail (VLIE)

Headquarters - United States Postal Service last word addressing abbreviation

Headquarters Department (SAUO)

Headquarters Detachment (SAUO)

Heard (ROG)

Hearding Distance (SAUS)

Hearing Distance - Medicine

Heart Disease - Medicine

Heat Detector - NFPA pre-fire planning symbol (NFPA)

Heat Dissipation (DNAB)

Heaven Dust - Medicine (EDAA)

Heavy Decoys (SAUS)

Heavy Distillate - Fuel technology

Heavy Draft (SAUS)

Heavy Drop (SAUO)

Heavy-Duty

Heidelberg - German license plate city code

Height Displacement (SAUS)

Helicopter Delivered

Helicopter Direction (DNAB)

Helicopter Director - Military (CAAL)

Heloma Durum - A hard corn - Orthopedics (DAVI)

Hematologic Disorder - Medicine (MELL)

Hemidesmosome - Cytology

Hemidiaphragm - Medicine (EDAA)

Hemodialysis - Nephrology

Hemodilution

Hemolytic Disease - Medicine (MELL)

Hemolyzing Dose - Medicine

Henry Draper - Astronomy term - Catalog entry

Henry Draper Catalogue - Astronomy

Hepatic Disease - Medicine (MELL)

Hepatosis Diaetetica - Veterinary science (OA)

Herniated Disc - Medicine

Hexadecimal Code - Computer science (IAA)

Hexagonal Domain Structure

Hexanedione - Organic chemistry

Hierarchical Dependency (SAUS)

Hierarchical Diagnosis (SAUS)

Hierarchical Direct

High Day - Communications term (DCT)

High-Definition

High Demand

High Density

High Detergent (WGA)

High Dose - Medicine

High Drag - Navy (NVT)

High Dust

High Duty (SAUS)

High Dynamic

Highland Division - British military (DMA)

Highly Desirable (KSC)

Hilda Doolittle - Initials used as pen name of American poet, 1886-1961

Hip Disarticulation - Medicine

Hip Dislocation (MELL)

Hip Dysplasia (SAUS)

Hirschsprung's Disease - Medicine (DMAA)

Histone Deacetylase - An enzyme

Historical Department (SAUO)

Historical Development

Historical Division - Air Force

Historic Deerfield (EA)

Historic District (SAUS)

Hitachi chip ID code (SAUS)

Hodgkin's Disease - Medicine

Hogshead

Holddown

Home Defence - British - World War II

- The Home Depot - NYSE symbol

- The Home Depot, Inc. - NYSE symbol (SPSG)

Home Dog

Homoeodomain - Genetics

Homoserine Dehydrogenase - An enzyme

Honduras - NCIC country-territory code (NCIC)

Honorable Discharge - Military

Honorary Degree - Freemasonry (ROG)

Hoover Dam (SAUS)

Hora Decubitus - At Bedtime - Pharmacy

Horizontal Distance - Photography (OA)

Horizontal Drain

Horizontal Drive

Hormone-Dependent - Medicine (DB)

Horse-Drawn

Hospital Day (DAVI)

Host-Dependent (SAUS)

Hot Drawing (SAUS)

Hot Drive - Automotive testing

Hourly Difference - Navigation

House Doctor (SAUS)

House Document

House Dust (DMAA)

House of Delegates (SAFN)

Housing Debtline - Telephone service - British

Housing Density

Hub Diameter (SAUS)

Huddersfield - Postcode (ODBW)

Human Development

Human Dialogue Service (VLIE)

Human Diploid - Medicine (EDAA)

Humanitarian Deferment - Military

Humanitarian Demining - Military

Humper Dears (EA)

Hundred

Hunter and Driffield - System to indicate film emulsion speed (BARN)

Huntington's Disease - Medicine

Hurel Dubois - Societe de Construction des Avions Hurel Dubois - France - ICAO aircraft manufacturer identifier (ICAO)

Hurricane Deck

Hydatid Disease - Medicine (MAE)

Hydralazine - Antihypertensive drug

Hydrodynamics (SAUS)

Hydrogendeuterium (SAUS)

Hydrogen Drain (MCD)

Hydrographic Department (SAUO)

Hydroxydopamine (DB)

Hypotonic Duodenogram - Medicine

Mustard Gas - Also, H, HS, HT, M - Poison gas - US Chemical Corps symbol

New York Helicopter - ICAO designator (AD)

Head (WDMC)

Hora Decubitus - At Bedtime - Latin (STED)

Head (TBD)

Headland - Maps and charts