HD
Encyclopedia
HD may refer to:
Science and technology
- High-definitionHigh-definitionHigh-definition refers to an increase in display or visual resolution such as in:*High-definition television , television formats that have a higher resolution than their contemporary counterparts...
, reference to:- high-definition videoHigh-definition videoHigh-definition video or HD video refers to any video system of higher resolution than standard-definition video, and most commonly involves display resolutions of 1,280×720 pixels or 1,920×1,080 pixels...
- high-definition televisionHigh-definition televisionHigh-definition television is video that has resolution substantially higher than that of traditional television systems . HDTV has one or two million pixels per frame, roughly five times that of SD...
(HDTV) - Intel High Definition AudioIntel High Definition AudioIntel High Definition Audio refers to the specification released by Intel in 2004 for delivering high-definition audio that is capable of playing back more channels at higher quality than previous integrated audio codecs like AC'97...
- HD VoiceWideband AudioWideband audio is an audio technology used in telephony. It extends the frequency range of audio signals transmitted over telephone lines, resulting in higher quality speech. The range of the human voice extends from 80 Hz to 14 kHz but traditional, voiceband or narrowband telephone calls limit...
- high-definition video
- Hard drive, a computer device which stores digitally encoded data, also known as HDD
- Henry Draper CatalogueHenry Draper CatalogueThe Henry Draper Catalogue is an astronomical star catalogue published between 1918 and 1924, giving spectroscopic classifications for 225,300 stars; it was later expanded by the Henry Draper Extension , published between 1925 and 1936, which gave classifications for 46,850 more stars, and by the...
, an astronomical catalogue often used to designate stars - High density, in reference to a floppy disk, other magnetic media or the optical formats HD DVD and Blu-ray Disc
- Homeopathic doctor, a doctor whom practices homeopathyHomeopathyHomeopathy is a form of alternative medicine in which practitioners claim to treat patients using highly diluted preparations that are believed to cause healthy people to exhibit symptoms that are similar to those exhibited by the patient...
, also known as HD - Hybrid driveHybrid driveA Hybrid Drive, Hybrid Hard Drive , or Hybrid Hard Disk Drive is a type of large-buffer computer hard disk drive. It is different from standard hard drives in that it integrates a cache using non-volatile memory or even a small solid-state drive...
, a type of notebook computer hard drive that utilizes a large buffer - Hydrogen deuterideHydrogen deuterideHydrogen deuteride is a diatomic molecule composed of the two isotopes of hydrogen: the majority isotope 1H protium and 2H deuterium. Its molecular formula is HD.- Availability in nature :...
, a diatomic compound of hydrogen and deuterium - HD RadioHD RadioHD Radio, which originally stood for "Hybrid Digital", is the trademark for iBiquity's in-band on-channel digital radio technology used by AM and FM radio stations to transmit audio and data via a digital signal in conjunction with their analog signals...
, an abbreviation from the term Hybrid Digital/analog radio - HD Photo, an image format
- The chemical warfare agent sulfur mustardSulfur mustardThe sulfur mustards, or sulphur mustards, commonly known as mustard gas, are a class of related cytotoxic, vesicant chemical warfare agents with the ability to form large blisters on exposed skin. Pure sulfur mustards are colorless, viscous liquids at room temperature...
, which in its distilled form is referred to as HD - HyperdeformationHyperdeformationIn nuclear physics, hyperdeformation is theoretically predicted states of an atomic nucleus with extremely elongated shape and very high angular momentum. Less elongated states, superdeformation, has been well observed, but the experimental evidence for hyperdeformation is more limited....
, extremely deformed atomic nuclei - High-density polyethylene, a high-density polyethylene plastic material seen in milk containers and various juice beverages
- Human DevelopmentHuman developmentHuman development may refer to:* Human development , the process of a human becoming biologically mature* Developmental psychology, also known as human development* Human development , as it relates to economics and standards of living...
Academia
- Higher diplomaHigher diplomaA higher diploma is an academic award in Libya, United Kingdom, Hong Kong, Ireland and Oman. In Libya the award is equivalent to a bachelor's degree in engineering or technology, in Hong Kong it is below the standard of the bachelor's degree, in Ireland it is above the standard of the bachelor's...
, an academic award - National History Day, an American history competition, somewhat similar to Science Fair
Business
- Harley-DavidsonHarley-DavidsonHarley-Davidson , often abbreviated H-D or Harley, is an American motorcycle manufacturer. Founded in Milwaukee, Wisconsin, during the first decade of the 20th century, it was one of two major American motorcycle manufacturers to survive the Great Depression...
, an iconic American motorcycle manufacturer established in 1903 - Headphone DustHeadphone DustHeadphone Dust is the name of a record label set up by British musician and audio engineer Steven Wilson to issue music by his solo projects. Many of them are one-off limited editions. The label primarily distributes music by Bass Communion, IEM and Wilson's "Cover Version" singles...
, a record label run by music artist Steven Wilson - Hokkaido International AirlinesHokkaido International Airlines, also known as is a Japanese low-cost airline operating scheduled service between Tokyo and cities in Hokkaidō. It is headquartered in the in Chūō-ku, Sapporo, and its main base of operations is Tokyo International Airport in Ōta, Tokyo...
, a Japanese low-cost airline with IATA designator HD established in 1996 - The Home DepotThe Home DepotThe Home Depot is an American retailer of home improvement and construction products and services.The Home Depot operates 2,248 big-box format stores across the United States , Canada , Mexico and China, with a 12-store chain...
, a chain of home improvement warehouse retailers established in 1978
Medicine
- Attention deficit hyperactivity disorder, known as Hyperactivity Disorder (HD), as in AD/HD
- HemodialysisHemodialysisIn medicine, hemodialysis is a method for removing waste products such as creatinine and urea, as well as free water from the blood when the kidneys are in renal failure. Hemodialysis is one of three renal replacement therapies .Hemodialysis can be an outpatient or inpatient therapy...
, Renal dialysis - Hip dysplasiaHip dysplasiaHip dysplasia is an abnormal formation of the hip socket that, in its more severe form, can eventually cause crippling lameness and painful arthritis of the joints. It is a genetic trait that is affected by environmental factors...
- Hirschsprung's diseaseHirschsprung's diseaseHirschsprung's disease , or congenital aganglionic megacolon is a serious medical problem where the enteric nervous system is missing from the end of the bowel. The enteric nervous system is a complex network of neurons and glia that controls most aspects of intestinal function...
- Hodgkin's disease, a blood Lymphoma cancers
- Hormone disruptor
- Huntington's diseaseHuntington's diseaseHuntington's disease, chorea, or disorder , is a neurodegenerative genetic disorder that affects muscle coordination and leads to cognitive decline and dementia. It typically becomes noticeable in middle age. HD is the most common genetic cause of abnormal involuntary writhing movements called chorea...
, a genetic disorder affecting the central nervous system - The HD gene, a historical name for the huntingtinHuntingtinThe Huntingtin gene, also called HTT or HD gene, is the IT15 gene which codes for a protein called the huntingtin protein...
gene, which can cause Huntington's disease when it has certain properties - Hansen's disease (leprosy)
People
- Hilda Doolittle (1886–1961), a 20th century American poet and novelist
- HD (commentator)HD (commentator)Alex Do, better known by his online alias HD or HDStarcraft, is an electronic sports shoutcaster specializing in providing commentary for StarCraft II: Wings of Liberty, a video game published by Blizzard Entertainment and played on the online gaming service Battle.net...
, American electronic sports shoutcaster
Other
- The HD postcode area, covering Huddersfield, Brighouse and Holmfirth in England, UK
- Hunedoara (HD)Hunedoara CountyHunedoara is a county of Romania, in Transylvania, with its capital city at Deva.-Demographics:In 2002, it had a population of 485,712 and the population density was 69/km².*Romanians - 92%*Hungarians - 5%*Romas - 2%*Germans under 1%....
, an abbreviation for Hunedoara County, RomaniaRomaniaRomania is a country located at the crossroads of Central and Southeastern Europe, on the Lower Danube, within and outside the Carpathian arch, bordering on the Black Sea...
, or code used on Romanian license plates for Hunedoara County - HeidelbergHeidelberg-Early history:Between 600,000 and 200,000 years ago, "Heidelberg Man" died at nearby Mauer. His jaw bone was discovered in 1907; with scientific dating, his remains were determined to be the earliest evidence of human life in Europe. In the 5th century BC, a Celtic fortress of refuge and place of...
(code used on German license plates) - Hit Dice, a statistic related to hit points, indicating role-playing game characters' health or durability
- Holocaust denialHolocaust denialHolocaust denial is the act of denying the genocide of Jews in World War II, usually referred to as the Holocaust. The key claims of Holocaust denial are: the German Nazi government had no official policy or intention of exterminating Jews, Nazi authorities did not use extermination camps and gas...
, consists of claims that the genocide of Jews during World War II did not happen - Humpty DumptyHumpty DumptyHumpty Dumpty is a character in an English language nursery rhyme, probably originally a riddle and one of the best known in the English-speaking world. He is typically portrayed as an egg and has appeared or been referred to in a large number of works of literature and popular culture...
, a nursery rhyme character - Hawaiian DickHawaiian dickHawaiian Dick is a comic book created by writer B. Clay Moore and artist Steven Griffin, and published by Image Comics. The first Hawaiian Dick mini-series hit comic shops in December of 2002, and was subsequently followed in late 2003 by a second four issue mini-series called Hawaiian Dick: the...
, a 2002 comicbook - H&DHurter and DriffieldFerdinand Hurter and Vero Charles Driffield were nineteenth-century photographic scientists who brought quantitative scientific practice to photography through the methods of sensitometry and densitometry....
speed numbers, an old scale for measuring film speedFilm speedFilm speed is the measure of a photographic film's sensitivity to light, determined by sensitometry and measured on various numerical scales, the most recent being the ISO system....
established by HurterFerdinand HurterFerdinand Hurter was a Swiss industrial chemist who settled in England. He also carried out research into photography.-Early life:...
& DriffieldVero Charles DriffieldVero Charles Driffield was a chemical engineer who also became involved in photographic research.Driffield was educated at Liverpool Collegiate and Sandbach Grammar School. He also attended a private school in Southport where he came into contact with a Swiss master called Dr Knecht...