hexyl 5-aminolevulinateA substance that is used to find and kill tumor cells. It enters tumor cells and becomes activated when exposed to a special type of light.
HHV8A type of herpesvirus that may cause Kaposi sarcoma (a rare cancer that can cause skin lesions) and a type of lymphoma (cancer that begins in the lymph…
HIHigh- In meteorology, a region of high pressure; also known as anticyclone.
Hi-lo countA card counting system. 2 through 6 counts +1 and faces and aces count as -1.
Hi-opt IA card counting system promoted in The World's Greatest Blackjack Book. 3-6 count as +1, and tens (including faces) count as -1.
HibernaculaCaves or other structures used by bats for hibernation.
hibernationA power-saving feature that saves everything in memory on disk, turns off your monitor and hard disk, and then turns off your computer.
hibernation fileA file created during hibernation that contains all CPU memory and registers information.
Hidden Files or DataFiles or data not visible in the file directory; cannot be accessed by unauthorized or unsophisticated users.
Hidden keywordsKeywords that are placed in the HTML source in such a way that these words are not viewable by human visitors looking at the rendered web page.
Hidden TextText on a web page which is visible to search engine spiders but not visible to human visitors.
Hidden Text - SEO Spam TacticHidden Text is a SEO spam tactic to hide contextual html text from human visitors to a webpage, however making it available to search engines to spider…
hierarchical computer networkA computer network in which processing and control functions are performed at several levels by computers specially suited for the functions performed…
hierarchical data modelorganization of files based on relationships established along progressive levels of a tree structure, or hierarchy
hierarchical descriptionThe principal of archival description in which documentary material is described in aggregates at various prescribed hierarchical levels.
Hierarchical namespaceAny namespace that is hierarchically structured and provides rules that allow the namespace to be partitioned.
hierarchical namingA system of naming associated with IBM® Lotus® Notes® IDs that reflects the relationship of names to the certifiers in an organization.
hierarchical routingRouting that is based on hierarchical addressing. Note: Most Transmission Control Protocol/Internet Protocol (TCP/IP) routing is based on a two-level…
Hierarchical Storage Management (HSM)Software that automatically migrates files from on-line to near-line storage media, usually on the basis of the age or frequency of use of the files.
hierarchical viewA view that distinguishes between main documents and response documents. Each main document has its response documents indented under it.
hierarchically synchronized networkA mutually synchronized network in which some clocks exert more control than others, the network operating frequency being a weighted mean of the natural…
hierarchyA classification of relationships in which each item except the top one (known as the root) is a specialized form of the item above it.
HIFUA procedure in which high-energy sound waves are aimed directly at an area of abnormal cells or tissue in the body.
High(abbrev. HI)- In meteorology, a region of high pressure; also known as anticyclone.
High Assurance Guard (HAG)An enclave boundary protection device that controls access between a local area network that an enterprise system has a requirement to protect, and an…
High AvailabilityA continuously available computer system is characterized as having essentially no downtime in any given year. A system with 99.
high availability (HA)NetApp support for failover; that is, one appliance assuming the identity and duties of a failed appliance.
High BetA wager that one of the high numbers (19-36) will win the next spin.
high blood glucoseA condition that occurs in people with diabetes when their blood glucose levels are too high.
high blood pressure(hy blud PREH-sher) A blood pressure of 140/90 or higher. High blood pressure usually has no symptoms.
high blood sugar(⦠blud SHUH-gur) Higher than normal amount of glucose (a type of sugar) in the blood.
High Cardthis is the highest card in a player's hand, which may be used as a tie-breaker if a player and dealer have the same hand.
High CloudsThese clouds have bases between 16,500 and 45,000 feet in the mid latitudes. At this level they are composed of primarily of ice crystals.
High damA dam over 300 feet high. See low dam and medium-height dam.
High Deductible Health Plan (HDHP)A high deductible health plan (HDHP) requires substantially higher than average out-of-pocket expenses before the insurance company will start paying for…
High Definition Television (HDTV)Television that has approximately twice the horizontal and twice the vertical emitted resolution specified by the NTSC standard.
High Density Aerospace Control Zone (HIDACZ)Airspace designated in an airspace control plan or airspace control order, in which there is a concentrated employment of various weapons and users.
High Earth Orbit (HEO)An orbit about the earth at an altitude greater than 3,000 nautical miles (about 5,600 kilometers).
High EndoatmosphereThat portion of the earths atmosphere, generally above 40 km altitude.
High Endoatmospheric Defense Interceptor (HEDI)OBSOLETE. Interceptor concept designed to engage RVs within the (upper or high endo ) atmosphere. (Predecessor to Endo- Exoatmospheric Interceptor (E2I).
High Energy EventIn solar-terrestrial terms, flares (class two or more) with outstanding Centimetric Bursts and SID.
High Frequency (HF)The portion of the radio frequency spectrum between between 3 and 30 MHz
high gradeWhen referring to cancerous and precancerous growths, a term used to describe cells that look abnormal under a microscope.
High Handthis is another name for the Hand Behind or the Five Card Hand.
High hazardA downstream hazard classification for dams in which more than 6 lives would be in jeopardy and excessive economic loss (urban area including extensive…
High heatAbove normal (260 degrees Fahrenheit) tire temperature.
High Impact SystemAn information system in which at least one security objective (i.e., confidentiality, integrity, or availability) is assigned a FIPS 199 potential impact…
High LatitudesWith specific reference to zones of geomagnetic activity, "high latitudes" refers to 50º to 80º geomagnetic.
high level programming languageLanguages such as Java, C++, Ada, etc. which provide programmers with features such as control structures, methods, classes, packages, etc.
High liquefaction potentialRefers to the susceptibility of soils to liquefy when subjected to sudden loading, such as intense ground shaking from an earthquake.
High net worth individualAny individual whose net worth is greater than $2 million immediately before the transaction.
High or low betAn even money bet, either for the top half (19-36) or the bottom half (1-18) of the numbers. (This is an outside bet.)
High Order Language (HOL)A programming language that requires little knowledge of the computer on which a program will run, can be translated into several different machine…
high probability of completion (HPC)With reference to American National Standard ANSI T1.631-1993, an aspect of National Security and Emergency Preparedness (NS/EP) telephone calls, as…
High Risk (of severe thunderstorms)Severe weather is expected to affect more than 10 percent of the area. A high risk is rare, and implies an unusually dangerous situation and usually the…
High Risk Pool Plan (State)Similar to the Pre-Existing Condition Insurance Plan under the Affordable Care Act, for years many states have offered plans that provide coverage if you…
High School Deputy RegistrarsEach principal of a public or private high school or the principal's designee shall serve as a deputy registrar for the county in which the school is…
High Seas Forecast(HSF) - Marine forecasts for the major oceans of the world. In this context, major gulfs or seas (e.g.
High Sierra formatA standard format for placing fields and directories on CD ROM, revised and adopted by the International Organization for Standardization as ISO 9660.
High SurfLarge waves breaking on or near the shore resulting from swells spawned by a distant storm.
High Surf AdvisoryA High Surf Advisory is issued when breaking wave action poses a threat to life and property within the surf zone. High surf criteria vary by region.
High Surf WarningA High Surf Warning is issued when breaking wave action results in an especially heightened threat to life and property within the surf zone.
high throughput screeningAutomated systems designed to process large numbers of assays, especially in the context of genotyping.
High WindSustained wind speeds of 40 mph or greater lasting for 1 hour or longer, or winds of 58 mph or greater for any duration.
High Wind AdvisoryThis product is issued by the National Weather Service when high wind speeds may pose a hazard. The criteria for this advisory varies from state to state.
High Wind WarningThis product is issued by the National Weather Service when high wind speeds may pose a hazard or is life threatening.
High Wind WatchThis product is issued by the National Weather Service when there is the potential of high wind speeds developing that may pose a hazard or is life…
High-Cost Excise TaxUnder the Affordable Care Act starting in 2018, a tax on insurance companies that provide high-cost plans.
high-dose chemotherapy(hy-dose kee-moh-THAYR-uh-pee) An intensive drug treatment to kill cancer cells, but that also destroys the bone marrow and can cause other severe side…
high-dose radiation(hy-dose RAY-dee-AY-shun) An amount of radiation that is greater than that given in typical radiation therapy.
high-dose-rate remote brachytherapy(hy-dose-rate ree-MOTE BRAY-kee-THAYR-uh-pee) A type of internal radiation treatment in which the radioactive source is removed between treatments.
high-dose-rate remote radiation therapy(hy-dose-rate ree-MOTE RAY-dee-AY-shun THAYR-uh-pee) A type of internal radiation treatment in which the radioactive source is removed between treatments.
high-energy photon therapy(hy-EH-nur-jee FOH-ton THAYR-uh-pee) A type of radiation therapy that uses high-energy photons (units of light energy).
high-frequency distribution frame (HFDF)A distribution frame that provides terminating and interconnecting facilities for those combined supergroup modulator output circuits and combined…
high-grade lymphomaA type of lymphoma that grows and spreads quickly, and has severe symptoms. It is seen frequently in patients who are HIV-positive (AIDS-related lymphoma).
high-intensity focused ultrasound therapy(⦠in-TEN-sih-tee FOH-kust UL-truh-SOWND THAYR-uh-pee) A procedure in which high-energy sound waves are aimed directly at an area of abnormal…
High-level cloudsHigh-level clouds Cirrus, Cirrocumulus and Cirrostratus are high-level clouds.
high-level controlIn the hierarchical structure of a primary or secondary data transmission station, the conceptual level of control or processing logic that (a) is above…