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  • gallstone

    A solid mass formed in the gallbladder composed of cholesterol and bile salts.

  • Galton whistle

    An instrument for emitting high-pitched tones and ultrasound for determining the upper limits of the hearing range in humans and other animals

  • galvanism

    Any form of medical treatment that uses electricity.

  • galvanometer

    An instrument for detecting and measuring small electric currents.

  • gas burners

    Burners for the combustion of gas, usually with various arrangements of holes through which gas issues.

  • gas cylinder

    A cylinder in which pressurized gas is stored

  • gas gangrene

    Death and decay of wound tissue infected by a soil-based bacteria. Toxins produced by the bacterium cause decay of connective tissue and the generation of gas.

  • gas key

    A standard key used for unlocking the gas lamps in railway carriages in order to service and maintain them.

  • gas mask

    A respirator that contains a chemical air filter and is worn over the face as protection against toxic gases and aerosols

  • gas turbine train

    A train powered by gas turbine propelled motive power.

  • gastroenteritis

    A bacterial or viral infection caused by the inflammation of both the stomach and the small intestine.

  • gastro-intestinal surgery

    Any type of surgery that addresses problems with the stomach or small intestine.

  • gates

    Swinging or sliding barriers used to fill or close a gateway between two exterior spaces, often made of a grating or open framework or forming a heavy or rough structure.(W) Also, interior barriers resembling these. For barriers of more solid and finished construction and usually leading to interior spaces, use "doors."

  • gauge

    Use generally for devices designed to measure or otherwise determine the size, state, or mechanical accuracy of something.

  • gauge block

    Hardened steel block having two flat, parallel surfaces with the parallel distance between the surfaces marked to a guaranteed accuracy of a few millionths of an inch; used in manufacturing processes as a precise measuring standard.

  • gauge glass fitting

    The brass fitting holding the glass column indicating the level of the water in the boiler.

  • gender

    Has come to refer to the socially constructed roles and differences between men and women; as opposed to 'sex' which refers to the biological distinctions between male and female.

  • gene

    Part of the nucleus of a cell that determines how our bodies function. Genes are passed from parents to children.

  • genetic diseases

    Diseases, such as cystic fibrosis, that are passed from parents to child and which have their origins in changes to DNA.

  • genetic engineering

    The techniques involved in altering the characteristics of one organism by inserting genes from another organism into its DNA.

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