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Glossary

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H

  • hearse

    Wheeled vehicle designed to carry bodies to gravesites.

  • heart-lung machine

    A machine used to take over the functions of the heart and lungs during surgery. It allows a surgeon to carefully stop the heart while the vital organs continue to receive blood and oxygen.

  • heat exchangers

    Devices that transfer heat between two physically separated fluids; generally consists of a cylindrical shell with longitudinal tubes; one fluid flows inside, the other outside. DAC.

  • heating systems

    Assemblies of interrelated equipment designed to provide heat to buildings and other structures.

  • heliometer

    A form of split-lens micrometer originally devised for measuring the appparent diameter of the sun, but now employed for precision measurement of the angular separation and relative direction of two stars too far to be measured in the field of view of an ordinary telescope. Used to make the first successful parallax measurements of stars to determine their distance

  • helmet

    Any of various forms of protective coverings for the head, usually made of a hard material

  • Helmholtz pendulum

    myograph used to measure the velocity of nerve impulses

  • henbane

    A plant of the genus Hyoscyamus (Hyoscyamus Niger), a genus of poisonous plants known as the Nightshade or belladonna family. All parts of the plant are poisonous, and the leaves are used in neuralgic and pectorial troubles. It is poisonous to hens, hence the name. Also known as stinking nightshade because of the fetid odour of the plant.

  • hepatitis B

    Hepatitis B is a virus spread through the contact of bodily fluids. It is one hundred times more infectious than HIV, and can lead to severe liver damage, but there is an effective vaccine available.

  • heraldic motif

    A representation relating to heraldry.

  • herbal medicine

    the use of plant or plant extracts for medicinal purposes in order to improve the body's natural functions and restore balance. Herbal medicines are given in many forms (liquids, infusions, tablets, topical preparations, etc.) and form part of an increasing number of complementary medical therapies

  • hereditary

    Usually refers to a disease that is transmitted from parent to offspring.

  • heresy

    An opposite view to the established or commonly held belief of a religion.

  • hermetic

    A completely closed and airtight seal.

  • hernia

    A small amount of an organ or tissue bulging through an abnormal opening in the skin.

  • high chair - child's chair

    Child's chair with long legs, a feeding tray, and a footrest.

  • high frequency apparatus

    used to apply high frequency electric currents to the body for therapeutic reasons

  • hip bath

    A portable bath in which a person sits immersed up to the hips.

  • histology

    The study of the structure of tissues by means of special staining techniques combined with light and electron microscopy.

  • HIV

    Human Immunodeficiency Virus (HIV) is a virus that weakens vital cells in the immune system, and leads to AIDS. There are two strands: HIV-1, which leads to immunity suppression; and HIV-2, which is not as potent and is only common in West Africa. HIV is spread through direct contact with bodily fluids.

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