HD may refer to:
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Academia
- Handelshøjskolernes erhvervsøkonomiske Diplomuddannelse, a Danish evening course for a Graduate Diploma in Business and Administration
- Higher Diploma, an academic award
Business
- Harley-Davidson, an iconic American motorcycle manufacturer
- Headphone Dust, a record label run by music artist Steven Wilson
- Hokkaido International Airlines, a Japanese low-cost airline with IATA designator HD
- Home Depot, a chain of home improvement warehouse retailers
Medicine
- Attention-deficit hyperactivity disorder, known as Hyperactivity Disorder (HD), as in AD/HD
- Hip Dysplasia
- Hodgkin's disease
- Hormone disruptor
- Huntington's disease
- The HD gene, a historical name for the huntingtin gene, which can cause Huntington's disease when it has certain properties. A higher diploma is an academic award in Hong Kong and Ireland. Harley-Davidson Motor Company ( formerly HDI is an American manufacturer of Motorcycles based in Milwaukee Wisconsin. Headphone Dust is the name of a Record label set up by British Musician and Audio engineer Steven Wilson to issue music by his Steven John Wilson (born November 3, 1967) is the lead guitarist/singer/songwriter and the founder of Progressive rock band Porcupine Tree also known as is a Japanese Low-cost airline. Based in Sapporo, Hokkaidō, it operates between Tokyo and cities in Hokkaidō The Home Depot ( is an American Retailer of Home improvement and construction products and services Attention-Deficit Hyperactivity Disorder (ADHD is a neurobehavioral developmental disorder affecting about 3-5% of the world's population Hodgkin's lymphoma, also known as Hodgkin's disease is a type of Lymphoma first described by Thomas Hodgkin in 1832 Endocrine disruptors (sometimes also referred to as hormonally active agents) are Exogenous substances that act like Hormones in the Endocrine system Huntington's disease, also called Huntington's chorea, chorea major, or HD, is a genetic neurological disorder characterized after The Huntingtin Gene, also called HD ( Huntington's disease, also called Huntington's chorea, chorea major, or HD, is a genetic neurological disorder characterized after
People
- Hilary Duff, an American singer and actress
- Hilda Doolittle, also known as H. Hilary Erhard Duff (born September 28 1987 is an American Actress, pop Singer-songwriter HD (September 10 1886 – September 27 1961 born Hilda Doolittle, was an American poet, Novelist and Memoirist She is best known D. , an American poet
Science and technology
- Hard drive, a computer device which stores digitally encoded data, also known as HDD
- Henry Draper Catalogue, a sequential numbering system for stars ordered by right ascension
- High-definition, in reference to high-definition video, high-definition television (HDTV), or Intel High Definition Audio
- High density, in reference to a floppy disk, other magnetic media or the optical formats HD DVD and Blu-ray
- Hybrid drive, a type of notebook computer hard drive that utilizes a large buffer
- Hydrogen deuteride, a diatomic compound of hydrogen and deuterium
- HD Radio, an abbreviation from the term Hybrid Digital/analog radio
- HD Photo, an image format
- the chemical warfare agent sulfur mustard, which in its distilled form is referred to as HD
Other
- Harmonisation Document, a normative document in the European Union
- Hit Dice, a statistic related to hit points, indicating role-playing game characters' health or durability
- Holocaust denial
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