Glossary · MWE Terms · H
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TermTypeDefinitionClassificationsUpdated
Hedge NettlenounMWEperennial herb with an odorless rhizome widespread in moist places in northern hemisphereverified
Hedge PinknounMWEplant of European origin having pink or white flowers and leaves yielding a detergent when bruisedverified
Heir ApparentnounMWEan heir whose right to an inheritance cannot be defeated if that person outlives the ancestorverified
Heir PresumptivenounMWEa person who expects to inherit but whose right can be defeated by the birth of a nearer relativeverified
Heliocentric ParallaxnounMWEthe parallax of a celestial body using two points in the earth's orbit around the sun as the baselineverified
Helix AnglenounMWEthe constant angle at which a helix cuts the elements of a cylinder or coneverified
Helmet OrchidnounMWEany of numerous orchids of the genus Pterostylis having leaves in a basal rosette and green flowers often striped purple or brown or red with the dorsal sepal incurved to form a hoodverified
Help DesknounMWEa service that provides information and assistance to the users of a computer networkverified
help filenounMWEA help file (sometimes called a help system ) is a documentation component of a software program that explains the features of the program and helps the user understand its capabilities. A bit like an extensive, organized, and thorough collection of FAQ s (frequently asked questions), the help system's purpose is to provide the answers that a user needs to understand to use the program effectively.verified
Helper CellnounMWET cell with CD4 receptor that recognizes antigens on the surface of a virus-infected cell and secretes lymphokines that stimulate B cells and killer T cellsverified
Helper T CellnounMWET cell with CD4 receptor that recognizes antigens on the surface of a virus-infected cell and secretes lymphokines that stimulate B cells and killer T cellsverified
Hemal ArchnounMWEa structure arising ventrally from a vertebral centrum and enclosing the caudal blood vesselsverified
Hemipterous InsectnounMWEinsects with sucking mouthparts and forewings thickened and leathery at the baseverified
Hemlock Water DropwortnounMWEEuropean poisonous herb having tuberous roots, yellow juice that stains the skin, yellow flowers and foliage resembling celeryverified
Hemophilia BnounMWEa clotting disorder similar to hemophilia A but caused by a congenital deficiency of factor IXverified
Hemorrhagic FevernounMWEa group of illnesses caused by a viral infection (usually restricted to a specific geographic area)verified
Hemorrhagic SepticemianounMWEan acute infectious disease characterized by pneumonia and blood infectionverified
Hemorrhoidal VeinnounMWEany of several veins draining the walls of the anal canal and rectumverified
Hemp AgrimonynounMWEcoarse European herb with palmately divided leaves and clusters of small reddish-purple flower headsverified
Hemp FamilynounMWEtwo genera of erect or twining herbs that are pollinated by the wind, including the genera Cannabis and Humulusverified
Hemp NettlenounMWEcoarse bristly Eurasian plant with white or reddish flowers and foliage resembling that of a nettleverified
Hempen NecktienounMWEa rope that is used by a hangman to execute persons who have been condemned to death by hangingverified
Hepatitis anounMWEan acute but benign form of viral hepatitis caused by an RNA virus that does not persist in the blood serum and is usually transmitted by ingesting food or drink that is contaminated with fecal matterverified
Hepatitis BnounMWEan acute (sometimes fatal) form of viral hepatitis caused by a DNA virus that tends to persist in the blood serum and is transmitted by sexual contact or by transfusion or by ingestion of contaminated blood or other bodily fluidsverified
Hepatitis CnounMWEa viral hepatitis clinically indistinguishable from hepatitis B but caused by a single-stranded RNA virusverified
Herb BennetnounMWEhairy Eurasian plant with small yellow flowers and an astringent root formerly used medicinallyverified
Herb of GracenounMWEEuropean strong-scented perennial herb with grey-green bitter-tasting leavesverified
Herb ParisnounMWEEuropean herb with yellow-green flowers resembling and closely related to the trilliumsverified
Herbal MedicinenounMWEa medicine made from plants and used to prevent or treat disease or promote healthverified
Herbal TherapynounMWEthe use of plants or plant extracts for medicinal purposes (especially plants that are not part of the normal diet)verified
Herd's GrassnounMWEgrass with long cylindrical spikes grown in northern United States and Europe for hayverified
Herediatry Spinal AtaxianounMWEsclerosis of the posterior and lateral columns of the spinal cordverified