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 D
  • discoid lupus erythematosus

    A round, red, scaling rash on the nose, forehead, cheeks, scalp or other areas of the body. It may be…

  • disinfectant

    A chemical agent used to destroy microorganisms on inanimate objects.

  • disk

    A round, flat structure, particularly the fibrous cartilage layer between two vertebrae (the bones that make up the spine). Also…

  • diskectomy

    Removal of an intervertebral disk of the spine.

  • dislocation

    Displacement of a bone from a joint.

  • disorientation

    Mental confusion, especially of time, place or person.

  • distal

    A location farther from a point of reference. For example, the foot is distal to the knee, relative to the…

  • diuresis

    Increased elimination of urine.

  • diverticula

    Pouches or sacs opening out from a main cavity or tubular organ of the body.

  • diverticulitis

    Inflammation of small pouches that may form on the wall of the colon.

  • diverticulosis

    A condition in which pouches form on the wall of the colon.

  • dorsal

    Toward the back.

  • douche

    A flow of liquid or vapor directed onto or into a part of the body.

  • Down syndrome

    A genetic disorder characterized by some degree of mental retardation and by various physical malformations, such as slanted eyes and…

  • DPT

    A vaccine containing antigens from diphtheria, pertussis and tetanus.

  • dressing

    A bandage for an external wound.

  • dropsy

    Abnormal buildup of fluid in tissues or a body cavity.

  • duct

    A channel or passage through which fluids move.

  • duodenal

    Having to do with the duodenum.

  • duodenum

    The first part of the small intestine that begins at the stomach and is the entry point for the pancreatic…

  • Dupuytren's contracture

    Scarring of the palmar ligament in the hand, causing progressive curling of one or more fingers and a thickening of…