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  • Threshold Limit Valve (TLV)

    Concentration of a given material that may be tolerated for an 8-hour exposure during a regular work week without ill effects

  • thrombocyte

    A platelet; a cellular element of the blood involved in clotting.

  • thrombophlebitis

    A condition in which inflammation of a vein leads to the formation of a plug (thrombus) in the vein.

  • thrombosis

    The formation of a blood clot or thrombus.

  • thrombus

    A fixed blood clot that forms inside a blood vessel.

  • Throttle Control

    Device that controls the engine speed.

  • Thrust Plate

    Steel plate located on the exterior of a masonry building to which a tension rod is anchored

  • Thrust Plate

    Steel plate located on the exterior of a masonry building to which a tension rod is anchored

  • thyroid

    A gland located in the neck that produces hormones involved in the regulation of metabolism.

  • TIA

    An abbreviation for transient ischemic attack.

  • tibia

    The shin bone, located in the front part of the lower leg.

  • tic

    A spasmodic twitching of a facial muscle.

  • TID

    An abbreviation meaning "three times a day".

  • tidal volume

    The amount of air inhaled or exhaled during normal, quiet breathing; the volume of one breath.

  • tincture

    A dilute, alcoholic extract of a drug, e.g., tincture of iodine.

  • tinnitus

    A ringing or tinkling noise, or sometimes a buzzing or roaring noise, in the ears.

  • tissue

    A collection of cells of similar type that are specialized for performance of a particular function.

  • tissue plasminogen activator (TPA)

    A naturally occuring enzyme in the body that breaks down clots after about a week. It has been concentrated and refined to quickly (within minutes) dissolve clots of heart attacks, arterial emboli, and some CVAs.

  • Title Block

    Small information sectio on the face of every plan drawing; contains such information as name of project, title of the particular drawing, the scale used, and the date of drawing and/or revisions

  • Title Block

    Small information sectio on the face of every plan drawing; contains such information as name of project, title of the particular drawing, the scale used, and the date of drawing and/or revisions

  • titration

    In pharmacologic treatment, the method of administering a drug dose in very small increments at a time while carefully gauging the effect of each increment.

  • tolerance

    The progressive diminution of susceptibility to the effects of a drug after repeated doses.

  • Tones

    A series of two or three musical notes, used as an auditory alert over a radio or radio-paging system to indicate that a particular fire company, district, or territory is dispatched to service on a particular incident.

  • tonic-clonic

    Referring to the repetitive contraction and relaxation of muscle groups in a seizure.

  • Torching

    Not to be confused with crowning, is when a single or small group of trees "torch" or go up in flames. Torching and group torching are more of a nuisance whereas crown fire is of much greater concern.

  • total body water (TBW)

    The total water content of the body, equivalent to about 60 percent of body weight in the adult male. see TBW

  • Total Pressure

    Total amount of pressure loss in a hose assembly due to friction loss in the hose and appliances, elevation losses, or any other factors.

  • Total Stopping Distance

    Sum of the driver/operator reaction distance and the vehicle braking distance.

  • tourniquet

    A constricting device used circumferentially around an extremity to impede venous outflow or obstruct arterial inflow.

  • Tower Ladder

    Term used to describe a telescoping aerial platform fire apparatus.

  • toxemia

    A generalized poisoning of the system caused by absorption of bacterial products.

  • toxemia of pregnancy

    Eclampsia.