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


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  • midwife

    A person who helps women at childbirth, but who isn’t a nurse or physician.

  • microorganism

    A microscopic plant or animal.

  • microencephaly

    Having an abnormally small brain.

  • microbiology

    The study of living microbes, including bacteria, protozoa and molds.

  • microbe

    A microorganism, such as bacterium.

  • metrorrhagia

    Uterine bleeding, usually of normal amount occurring at irregular intervals.

  • metritis

    Inflammation of the uterus.

  • metra


  • metatarsal

    Any of the five bones of the foot directly jointed to each of the toes.

  • metastasis

    The spread of a disease from its primary site in the body to another location in the body. Usually refers…

  • metaphysis

    The wider portion at the end of a long bone where growth occurs in infants and children.

  • metacarpal

    Any of the five bones that make up the hand and join the wrist to the fingers.

  • metabolism

    The chemical and physical processes involved in building up, storing and using materials required for life.

  • menstruation

    The periodic discharge of blood and tissues from the uterus. This usually occurs about every four weeks in a woman…

  • menorrhagia

    Heavy bleeding during menstruation.

  • menopause

    The time at which the menstrual cycle gradually stops. Sometimes referred to as the “change of life.”

  • meniscus

    The cartilage in the knee joint.

  • meningitis

    Inflammation of the meninges as the result of infection by bacteria or viruses. Symptoms include high fever, headache, stiff neck…

  • meningioma

    Tumor of the meninges, usually benign and slow-growing.

  • meninges

    The three membranes covering the brain and spinal cord.

  • Meniere's syndrome

    A disorder of the inner ear characterized by dizziness, ringing in the ears and progressive hearing loss.