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 G
  • giantism

    Abnormal growth of the body due to an excessive amount of growth hormone produced by the pituitary gland.

  • giardiasis

    A diarrheal illness caused by infection with Giardia lamblia, a parasitic protozoan.

  • gingiva

    The gums.

  • gingivitis

    Inflammation of the gums.

  • gland

    An organ that releases a chemical. Endocrine glands are ductless and secrete hormones directly into the bloodstream. Exocrine glands secrete…

  • glaucoma

    An eye disease, characterized by increased pressure within the eye, that can result in blindness if not treated.

  • glomerulonephritis

    When the filtering units in the kidneys, called the glomeruli, are damaged, the kidneys don’t function properly and waste and…

  • glossitis

    Inflammation of the tongue.

  • glucose

    Dextrose. A simple six-carbon sugar naturally found in fruits, honey and blood.

  • goiter

    Enlargement of the thyroid gland.

  • gonad

    A sex gland (ovary or testis).

  • gonorrhea

    A highly contagious, sexually transmitted bacterial disease of the genital/urinary system.

  • gout

    A form of arthritis caused by deposits of uric acid crystals in the joints, usually the feet, hands and, especially,…

  • graft

    A piece of skin or other tissue used as a transplant.

  • Gram's stain

    A stain used as the first step in identifying bacteria.

  • grand mal

    A major epileptic seizure characterized by convulsions, unconsciousness and sometimes loss of urinary or bowel continence. Usually followed by a…

  • Graves' disease

    Overactive thyroid gland function (hyperthyroidism). Sometimes associated with protrusion of the eyes.

  • groin

    The region of the body where the thigh and lower abdomen meet.

  • Guillain-Barre syndrome

    A rare but reversible reaction to a viral illness or immunization that causes partial to complete loss of movement of…

  • gynecology

    The branch of medicine that deals with the study and treatment of reproductive diseases in women.

  • gynecomastia

    Overdevelopment of male breast tissue. Usually benign and temporary.