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


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  • blepharoplasty

    Plastic surgery on the eyelid.

  • blindness

    Loss of vision. Legally, visual acuity less than 20/200 with glasses.

  • blister

    Buildup of watery or bloody fluid under the skin.

  • blood

    The fluid circulating through the heart, arteries and veins. Blood is responsible for transporting oxygen to body tissues, carrying waste…

  • blood poisoning

    Infection within the circulatory system. A potentially life-threatening condition that requires prompt treatment.

  • blood pressure

    The pressure exerted by the blood against the walls of the blood vessels.

  • boil

    A skin infection characterized by a localized buildup of pus.

  • bone marrow

    The tissue within the cavity of the bones where new blood cells are made.

  • Borrelia

    A class of disease-causing bacteria that includes the organisms that cause relapsing fever and Lyme disease.

  • botulism

    An extremely dangerous form of food poisoning caused by the toxin of Clostridium botulinum.

  • bovine

    Having to do with cattle. For example, bovine insulin is insulin obtained from cattle.

  • bowel

    The tube involved in digestion and extending from the stomach to the anus. Consists of the small intestine and the…

  • Bowen's disease

    A precancerous skin condition that first appears as psoriasis-like scaling.

  • bowleg

    A deformity of the legs in which the space between the knees is greater than normal.

  • brace

    A device used to support a body part, correct or prevent deformities, or control movement.

  • bradycardia

    Slow heart rate and pulse, usually slower than 60 beats per minute.

  • Braxton Hicks contractions

    Contractions of the uterus during pregnancy that are sometimes mistaken for labor. Also called false labor.

  • breasts

    Milk-secreting glands protruding from the upper front part of a woman’s body.

  • breech birth

    A birth in which the feet or buttocks of the baby appear first through the birth canal.

  • bridge

    A structure that joins two parts. For example, a dental bridge contains artificial teeth and joins the natural teeth at…

  • Bright's disease

    Nephritis. A group of kidney diseases manifested by albumin in the urine and edema (swelling).