Dictionary

Gain a better understanding of medical terminology by searching our dictionary of more than 1,300 terms.

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All terms that start with the letter H
  • halitosis

    Bad breath.

  • hallucination

    The sensory perception of sights, sounds or objects that don't really exist.

  • hammer

    The malleus, a hammer-shaped bone in the middle ear.

  • hamstring

    The tendon located in the back of the knee and lower thigh.

  • hand-foot-and-mouth disease

    A viral infection characterized by a blister-like rash of the hands, feet and mouth.

  • hangnail

    A loose piece of skin at one side of a fingernail.

  • Hansen's disease

    Leprosy.

  • harelip

    Cleft lip or palate.

  • Hashimoto's thyroiditis

    A degenerative autoimmune disease of the thyroid gland that ultimately results in a marked reduction in the amount of thyroid hormone produced.

  • hay fever

    Allergic sensitivity to certain mold spores and pollens. Allergic reaction includes sneezing, itchy eyes, sore throat and runny nose.

  • heart

    The hollow, muscular organ responsible for pumping blood through the circulatory system.

  • heart block

    A condition in which electrical impulses aren't properly transmitted from the heart's upper to the lower chambers.

  • heart failure

    Inability of the heart to adequately pump blood.

  • heartburn

    Indigestion. A burning sensation in the chest caused by a reflux of acid into the esophagus or too much acid in the stomach.

  • heat exhaustion

    Headache, profuse sweating, weakness, muscle cramps, nausea and vomiting caused by excessive exposure to heat.

  • heat stroke

    A serious failure of the body's heat-regulating mechanism resulting from excessive exposure to intense heat. Also called sunstroke.

  • hemangioma

    A tumor or swelling that's composed of blood vessels.

  • hematemesis

    The vomiting of blood.

  • hematology

    The branch of medicine that pertains to blood and the organs involved in forming blood.

  • hematoma

    A tumor-like mass of coagulated blood in the soft tissues. A contusion or bruise.

  • hematuria

    The presence of blood in the urine.

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