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


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  • pilus


  • pigeon toe

    A foot condition where the toes turn in.

  • physiology

    The branch of medicine that deals with the function of the various parts of the living organism.

  • physician

    A doctor. An authorized practitioner of medicine.

  • photophobia

    Abnormal intolerance of light.

  • phonation

    Making vocal sounds.

  • phobia

    Any persistent, unreasonable abnormal fear.

  • phlegm

    Mucus, especially mucus produced by the lungs during inflammation or infection.

  • phlebotomy

    Withdrawal of blood from a vein.

  • phlebitis

    Inflammation of a vein.

  • phimosis

    Excessive tightness of the foreskin of the penis.

  • petit mal

    A mild seizure with a momentary loss of consciousness.

  • pernicious anemia

    Anemia due to vitamin B12 deficiency.

  • pernicious


  • peritonitis

    Inflammation of the peritoneum.

  • peritoneum

    The membrane lining the walls of the abdominal and pelvic cavity.

  • peristalsis

    The waves of contraction and relaxation of the smooth muscle of the digestive tract.

  • peripheral

    At or near the surface of the body. Located away from the center structure.

  • periosteum

    The connective tissue covering the bones of the body.

  • periodontitis

    Inflammation of the tissues around the teeth.

  • perineum

    The pelvic floor. In females, the region from the vagina to the anus. In males, the region from the base…