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Medical Dictionary Definitions A-Z List

Medical Dictionary Definitions A - Z - «D»:

  1. Disorder, specific developmental Disorder, specific developmental
    Disorder, specific developmental: A disorder that selectively affects one area of development, sparing essentially all other areas of development. For example, dysgraphia is one type of specific developmental disorder. In dysgraphia there is inability to write legibly. Problems in dysgraphia may...
  2. Disordered thinking Disordered thinking
    Disordered thinking: A failure to be able to "think straight." Thoughts may come and go rapidly. The person may not be able to concentrate on one thought for very long and may be easily distracted, unable to focus attention. The person may be unable to connect thoughts into logical sequences, with t...
  3. Disorders, lymphoproliferative Disorders, lymphoproliferative
    Disorders, lymphoproliferative: Malignant diseases of the lymphoid cells and cells from the reticuloendothelial system (which take up and sequester inert particles). The lymphoproliferative disorders are in contrast to the myeloproliferative disorders which are malignancies of certain bone marr...
  4. Disorders, myeloproliferative Disorders, myeloproliferative
    Disorders, myeloproliferative: Malignant diseases of certain bone marrow cells including those that give rise to the red blood cells, the granulocytes (types of white blood cells), and the platelets (crucial to blood clotting). The myeloproliferative disorders include myelophthisic anemia, erythrobl...
  5. Disruption sequence Disruption sequence
    Disruption sequence: The events that occur when a fetus that is developing normally is subjected to a destructive agent such as the rubella (German measles) virus. ...
  6. Dissect Dissect
    Dissect: To cut apart or separate tissue as, for example, for anatomical study or in surgery. Also, an artery is said to dissect when its wall is torn, as in a dissecting aneurysm....
  7. Dissecting aneurysm Dissecting aneurysm
    Dissecting aneurysm: A localized widening (dilatation) of an artery (an aneurysm) in which the wall of an artery rips (dissects) longitudinally. This occurs because bleeding into the weakened wall splits the wall. Dissecting aneurysms tend to affect the thoracic aorta. They are particularly a...
  8. Dissection Dissection
    Dissection: The process of cutting apart or separating tissue as, for example, in the study of anatomy or in the course of a surgical procedure....
  9. Dissection, aortic Dissection, aortic
    Dissection, aortic: See: Aortic dissection....
  10. Dissection, axillary Dissection, axillary
    Dissection, axillary: Surgery in which the axilla (the armpit) is opened -- to "dissect" means to "cut apart" -- in order to identify, examine, and sometimes remove structures such as lymph nodes or other tissue for diagnosis or treatment....
  11. Dissection, neck Dissection, neck
    Dissection, neck: Surgery in which the neck is opened -- to "dissect" means to "cut apart" -- in order to identify, examine, and sometimes remove structures such as lymph nodes or other tissue for diagnosis or treatment. A radical neck dissection involves removal of a tumor from the neck with an ad...
  12. Dissection, radical neck Dissection, radical neck
    Dissection, radical neck: See: Radical neck dissection....
  13. Disseminated sclerosis Disseminated sclerosis
    Disseminated sclerosis: See: Multiple sclerosis....
  14. Disseminated vaccinia Disseminated vaccinia
    Disseminated vaccinia: See Progressive vaccinia....
  15. Dissociation Dissociation
    Dissociation: In psychology and psychiatry, a perceived detachment of the mind from the emotional state or even from the body. Dissociation is characterized by a sense of the world as a dreamlike or unreal place and may be accompanied by poor memory of the specific events, which in severe form is kn...