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  • MDT

    Abbreviation for Mobile Data Terminal, often a specialized personal computer using a radio network for data transmission between communication centres and fire apparatus. Often connected to Computer-assisted dispatch system. May be used with a Global Positioning System receiver to locate Read on! →

  • mean arterial pressure (MAP)

    The pressure approximately midway between the systolic and diastolic blood pressures.

  • Means of egress

    The way out of a building during an emergency; may be by door, window, hallway, or exterior fire escape; local building codes will often dictate the size. location and type according to the number of occupants and the type of Read on! →

  • Means of Egress

    (1) Safe and continuous path of travel from any point in a structure leading to a public way; comprised of three parts: exit access, exit, and exit discharge.

  • Means of Egress

    (1) Safe and continuous path of travel from any point in a structure leading to a public way; comprised of three parts: exit access, exit, and exit discharge. (2) Continuous and unobstructed way of exit travel from any point in Read on! →

  • Mechanical Foam

    Foam that requires the blending of water, foam concentrate, and air to be developed.

  • Mechanical System

    Large equipment system within a building that may include but not limited to the climate control system; smoke, dust, and vapor-removal system; trash collection system; and automated mail system. Does not include general utility systems such as electric, gas, and Read on! →

  • Mechanical System

    Large equipment system within a building that may include but not limited to the climate control system; smoke, dust, and vapor-removal system; trash collection system; and automated mail system. Does not include general utility systems such as electric, gas, and Read on! →

  • mechanism of injury

    The way in which an injury occurred and the forces involved in producing the injury.

  • medial

    Toward the midline of the body.

  • mediastinum

    The space within the chest that contains the heart, major blood vessels, vagus nerve, trachea, and esophagus. It is located between the two lungs.

  • Medium Diameter Hose (MDH)

    2 1/2 or 3-inch hose that is used for both fire fighting attack and for relay-supply purposes.

  • Medium Rescue Vehicle

    Rescue vehicle somewhat larger and better equipped than a light rescue vehicle. This vehicle may carry powered hydraulic spreading tools and cutters, air bag lifting systems, power saws, oxyacetylene cutting equipment, etc.

  • Medium-diameter hose

    A hose with diameter between 2« and 3 inches (76 mm).

  • medulla oblongata

    The portion of the brain between the cerebellum and spinal cord that contains the centers for control of respiration and heart beat, together with other major control centers.

  • melanin

    The pigment that gives skin its color.

  • Membrane Structure

    Weather-resistant, flexible or semiflexible covering consisiting of layers of materials over a supporting framework

  • Membrane Structure

    Weather-resistant, flexible or semiflexible covering consisiting of layers of materials over a supporting framework

  • meninges

    The three membranes covering the spinal cord and brain; the dura mater (external), arachnoid (middle), and pia mater (internal).

  • meningitis

    Inflammation of the meninges. It may present with fever, stiff neck, and delirium.

  • menopause

    The time of a woman’s life when menstruation ceases.

  • menorrhagia

    Excessive flow during a menstrual period.

  • menses

    The discharge that occurs with the monthly menstrual period.

  • menstruation

    The process by which the uterine lining is shed each month by women between the ages of puberty and menopause.

  • mEq

    An abbreviation for milliequivalent.

  • Mercantile

    Occupancy Classification whose primary objective is the wholesale purchase and retail sale of goods for profit

  • Mercantile

    Occupancy Classification whose primary objective is the wholesale purchase and retail sale of goods for profit

  • mesentery

    Tissues by which the intestines are connected to the back surface of the abdominal cavity and that contain the blood vessels, lymphatics, and nerves supplying

  • metabolism

    The conversion of food into energy and waste products.

  • metacarpal bones

    The five bones that form the palm and back of the hand.

  • metaraminol

    A drug sometimes used in the treatment of shock for its stimulating effect on alpha (sympathetic) receptors, which causes vasoconstriction (trade name

  • meter

    A metric linear measurement, equal to 1,000 mm or 39.37 inches.