ExpertGlossary terms starting with H

1,452 terms

.htaccess Apache directory-level configuration file which can be used to password protect or redirect files. As a note of caution, make sure you copy your current .
H Prefix used to designate the human form of an enzyme. For example, hGH is human growth hormone.
H release Hardware-specific release. A software product that is restricted to run on an identified platform or subset of platforms.
Hábeas Corpus Designación que se le da a una variedad de órdenes o decretos judiciales cuyo principal objetivo es el de presentar a una persona ante un tribunal o…
H&S Health and Status.
H-1B cap H-1B cap is the number of new H-1B visas that are issued in a fiscal year. The visas are counted as one H-1B visa per person.
H-1B dependent employer H-1B dependent employer has: 25 or fewer full-time employees and at least eight H-1B workers; or 26-50 full-time employees and at least 13 H-1B workers…
H-1B worker H-1B worker is a temporary, nonimmigrant in a specialty occupation (professional or fashion model of high distinction) given status to work for an…
H-1B1 worker H-1B1 worker is a temporary, nonimmigrant of Chile or Singapore in a specialty occupation given status to work for an employer by USCIS via Form I-797…
H-Alpha In solar-terrestrial terms, this absorption line of neutral hydrogen falls in the red part of the visible spectrum and is convenient for solar…
H-bend A smooth change in the direction of the axis of a waveguide, throughout which the axis remains in a plane parallel to the direction of magnetic H-field…
H-channel In Integrated Services Digital Networks (ISDN), a 384-kb/s, 1472-kb/s, or 1536-kb/s channel, designated as "H0", "H10", and "H11", respectively…
H-component of the Geomagnetic Field (Geomagnetic Elements) In solar-terrestrial terms, the components of the geomagnetic field at the surface of the earth.
H-plane bend Synonym H-bend.
H. pylori A type of bacterium that causes inflammation and ulcers in the stomach or small intestine. People with H.
H/W Hardware.
H0 On a buoy report, Significant Wave Height is the average height (meters) of the highest one-third of the waves during a 20 minute sampling period.
H5 500 millibar level height (in a standard atmosphere this is near 5,500 meters (18,000 ft)
H7 height of the 700 millibar level. In a standard atmosphere this is near 3,000 meters (10,000 ft)
H8 height of the 850 millibar level.
H<sub>0</sub>, Hubble Constant A measure of the expansion rate and age of the universe. It appears to be between 60 and 80 kilometers per second per megaparsec.
HA Higher Authority.
HA (High Availability) A combination of technology, processes, and support partnerships that provide greater application or system availability.
HA1-receiver weighting A noise weighting used in a noise measuring set to measure noise across the HA1-receiver of a 302-type or similar instrument.
hA20 A monoclonal antibody that is being studied in the treatment of refractory B-cell non-Hodgkin lymphoma.
HAART Highly active antiretroviral therapy. Treatment for human immunodeficiency virus (HIV) infection that uses a combination of several antiretroviral drugs.
HABE High Altitude Balloon Experiment.
Habeas Corpus You have the body; a writ used to bring someone before the court.
habeas corpus The name of a writ having for its object to bring a person before a court.
Habendum Clause in a deed which defines the extent of ownership in the thing granted; begins with the words "To have and to hold."
Habilitation Services Health care services that help a person keep, learn or improve skills and functioning for daily living.
Habilitative Services Health care services that help a person keep, learn or improve skills and functioning for daily living.
Habilitative/Habilitation Services Health care services that help you keep, learn, or improve skills and functioning for daily living.
Habitability This stands for the affirmative defense, in an eviction action, where the tenant basically agrees that rent has not been paid and states the rent money is…
Habitat The natural environment where people, animals and plants live. In an aquatic environment, it includes the water, topography, structure and cover present…
Habitat alteration A change in the particular environment or place where an organism or species lives.
Habitat Areas of Particular Concern (HAPC) A habitat area designated by a Fishery Management Council under the Magnuson-Stevens Fishery Conservation and Management Act of 1976 to help focus…
Habitat degradation Decline in habitat quality that accompanies non-natural forms of disturbance.
Habitat Fragmentation Division of large tracts of natural habitat into smaller, disjunct parcels.
Habitat generalist (species) See Generalist
Habitat type An aggregation of all land areas potentially capable of producing similar plant communities at climax.
habituation The phenomenon whereby, after a number of sub-cultures, cells can grow without the addition to the tissue culture medium of previously obligatory factors.
HAC Abbreviation for human artificial chromosome.
hack 1. To break into or use a computer network or use a system without authorization, as a hacker might do. 2.
Hacker Someone who breaks into computer systems in order to steal, change or destroy information.
Hacktivist An individual who breaches Web sites or secured communications systems to deliver political messages, including those related to foreign policy, or…
Hadoop See http://hadoop.apache.org.
Hadoop Distributed File System (HDFS) The HDFS file system stores large files across multiple machines. It achieves reliability by replicating the data across multiple hosts, and hence does…
HADS High Altitude Defense System.
haemoglobin Protein containing iron, located in erythrocytes of vertebrates; important for the transportation of oxygen to the cells of the body.
haemolymph The mixture of blood and other fluids in the body cavity of an invertebrate.
haemophilia A sex-linked hereditary bleeding disorder in which it takes a long time for the blood to clot and abnormal bleeding occurs.
HAFA Short Sale when the homeowner sells the property for less than the full amount due on the mortgage.
Hagelbarger code A convolutional code that enables error bursts to be corrected provided that there are relatively long error-free intervals between the error bursts.
Hague Line The North Atlantic boundary between the U.S. and Canada fishing waters as determined by the World Court in The Hague, Netherlands.
HAI Prevention Collaborative A group of facilities that are engaged in an effort to improve an outcome, in this case to reduce HAIs.
Hail Showery precipitation in the form of irregular pellets or balls of ice more than 5 mm in diameter, falling from a cumulonimbus cloud.
Hail Contamination A limitation in NEXRAD rainfall estimates whereby abnormally high reflectivities associated with hail are converted to rainfall rates and rainfall…
Hail Index An indication of whether the thunderstorm structure of each storm identified is conducive to the production of hail.
Hail Size Typically refers to the diameter of the hailstones. Warnings and reports may report hail size through comparisons with real-world objects that correspond…
Hail Spike An area of reflectivity extending away from the radar immediately behind a thunderstorm with extremely large hail.
hailstones Transparent or partially opaque particles of ice that range in size from that of a pea to that of golf balls.
Haines Index This is also called the Lower Atmosphere Stability Index. It is computed from the morning (12Z) soundings from RAOB stations across North America.
hair follicle (FOL-i-kul) A shaft or opening on the surface of the skin through which hair grows.
Haircut A haircut, in the financial industry, is a percentage discount that's applied informally to the market value of a stock or the face value of a bond in an…
hairpin loop A region in one strand of a polynucleotide which, due to an inverted repeat in the sequence, may under appropriate conditions fold back on itself and form…
hairy cell leukemia (HAYR-ee SEL loo-KEE-mee-uh) A rare type of leukemia in which abnormal B-lymphocytes (a type of white blood cell) are present in the bone marrow, spleen…
hairy root culture A culture consisting of highly branched roots of a plant. A plant tissue is treated with the bacterium Agrobacterium rhizogenes containing the Ri plasmid…
hairy root disease A disease of broad-leaved plants, where a proliferation of root-like tissue is formed from the stem.
HAL (Hardware Abstraction Layer) A layer between the physical hardware of a computer and the software that runs on that computer designed to hide differences in the underlying hardware…
Haldol (HAL-dol) A drug used to treat certain mental and neurological disorders. It is also being studied in the treatment of nausea and vomiting caused by some…
HALE High Altitude Long-Endurance.
HALE UAV High Altitude Long Endurance Unmanned Aerial Vehicle.
Half Duplex Transmission systems which can send and receive, but not at the same time.
half-duplex (HDX) operation Operation in which communication between two terminals occurs in either direction, but in only one direction at a time.
Half-graben A geological term that describes a sedimentary basin where one side is bounded by a normal (extensional) fault.
Half-life The time in which half the atoms of a particular radioactive nuclide disintegrate. The half-life is a characteristic property of each radioactive isotope.
half-sibling (HAF-SIB-ling) A person's brother or sister who has one parent in common.
Half-Value Thickness (HVT) The thickness of a given material, which will absorb half the gamma radiation incident upon it.
Halftone See Dithering.
halftone characteristic In facsimile systems, the relationship between the density of the recorded copy and the density of the object, i.e., the original. 2.
haline related to salt.
hallucination (huh-LOO-sih-NAY-shun) A sight, sound, smell, taste, or touch that a person believes to be real but is not real.
Hallway page a page that serves as an index to a group of pages that you would like the search engine spiders to find.
Halo Any of a variety of bright circles or arcs centered on the sun or moon, caused by the refraction or reflection of light by ice crystals suspended in the…
HALO II High Altitude Observatory II
Halocarbons Compounds containing either chlorine, bromine or fluorine and carbon. Such compounds can act as powerful greenhouse gases in the atmosphere.
Halofantrine A drug used against malaria in some countries, but not recommended by CDC.
halofuginone hydrobromide A substance that is being studied for its ability to slow the growth of connective tissue and prevent the growth of new blood vessels to a solid tumor.
Halons Compounds, also known as bromofluorocarbons, that contain bromine, fluorine, and carbon.
haloperidol (ha-loh-PAYR-ih-dol) A drug used to treat certain mental and neurological disorders.
halophyte A plant species adapted to soils containing a concentration of salt that is toxic to most plant species. See: salt tolerance.
Halophytic Salt-loving. Plants that thrive in soils that contain salt and/or sodium. A plant that grows in salty or alkaline soil.
Halsted radical mastectomy (HAWL-sted RA-dih-kul ma-STEK-toh-mee) Surgery for breast cancer in which the breast, chest muscles, and all of the lymph nodes under the arm are removed.
halt To stop, in an orderly manner, all activity in a computer system.
hamartoma (ham-ar-TOE-ma) A benign (noncancerous) growth made up of an abnormal mixture of cells and tissues normally found in the area of the body where the growth…
hammering A key search attack in which an unauthorized user guesses at a PIN or password many times.
Hammermill A device consisting of a rotating head with free-swinging hammers which reduce chips or hogged fuel to a predetermined particle size through a perforated…
Hamming code An error-detecting and error-correcting binary code, used in data transmission, that can (a) detect all single- and double-bit errors and (b) correct all…
Hamming Distance The number of non-corresponding digits in a string of binary digits; used to measure dissimilarity.