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Drugs and diseases reference index

Drugs and diseases reference index
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Medical Dictionary Definitions A-Z List

Medical Dictionary Definitions A - Z - «R»:

  1. Roentgen Roentgen
    Roentgen: An international unit of X-radiation or gamma-radiation. Abbreviated R. Named for Wilhelm Roentgen....
  2. Roentgen ray Roentgen ray
    Roentgen ray: Term coined around 1890 that preceded X-ray and is now synonymous with it. Named for Wilhelm Roentgen, a German professor of physics. Roentgen wanted to prove his hypothesis that cathode rays could penetrate substances besides air. When he saw that he could film his thumb and forefing...
  3. Roentgen, Wilhelm Roentgen, Wilhelm
    Roentgen, Wilhelm: Wilhelm Conrad Rontgen (1845-1923), German-born, Dutch-educated physicist who first observed and documented X-rays on November 8, 1895. He made this seminal discovery by accident while experimenting with a set of cathode ray instruments. He was surprised to find a flickering imag...
  4. Roentgenology Roentgenology
    Roentgenology: Radiology, the science of radiation and, specifically, the use of both ionizing (like X-ray) and nonionizing (like ultrasound) modalities for the diagnosis and treatment of disease. Roentgenology is named for Wilhelm Conrad Roentgen who discovered X-rays. Roentgen, a professor of ...
  5. Rohypnol Rohypnol
    Rohypnol: The trade name for flunitrazepam, which has been abused as a "date rape" drug. Rohypnol produces sedative-hypnotic effects including muscle relaxation and amnesia. It can produces physical and psychological dependence and can be lethal when mixed with alcohol and/or other depressants. It i...
  6. ROMA ROMA
    ROMA: Representational oligonucleotide microarray analysis. A method for the detection of genomic aberrations between any two samples of DNA. ROMA measures the relative concentration of DNA in the two samples by hybridizing differentially labeled samples to a set of probes. By arraying oligonucleot...
  7. Romano-Ward syndrome Romano-Ward syndrome
    Romano-Ward syndrome: See: Long QT syndrome....
  8. Roofer's knee Roofer's knee
    Roofer's knee: See prepatellar bursitis. ...
  9. Roofies Roofies
    Roofies: Street term for Rohypnol....
  10. Rooting reflex Rooting reflex
    Rooting reflex: A reflex seen in newborn babies, who automatically turn their face toward the stimulus and make sucking (rooting) motions with the mouth when the cheek or lip is touched. The rooting reflex helps to ensure breastfeeding....
  11. Rorschach test Rorschach test
    Rorschach test: A psychological test involving inkblots. The inkblots are used to determine what a person perceives (reads into) in the enigmatic and highly ambiguous shapes. Ten standardized blots are shown one at a time to a subject and their responses are recorded. The Rorschach test became a co...
  12. Rosacea Rosacea
    Rosacea: A chronic skin disease that affects the middle third of the face with persistent redness over the areas of the face and nose that normally blush: mainly the forehead, the chin and the lower half of the nose. The tiny blood vessels in these areas enlarge (dilate) and become more visible thr...
  13. Rosacea keratitis Rosacea keratitis
    Rosacea keratitis: A condition affecting the eyes in about half of all cases of rosacea. It is characterized by burning and grittiness of the eyes (conjunctivitis). If this is not treated, inflammation of the cornea may impair vision....
  14. Rosary pea Rosary pea
    Rosary pea: See: Abrin....
  15. Roseola Roseola
    Roseola: Roseola is a childhood illness caused by virus infection characterized by high fevers followed by a skin rash. Roseola is also formally called roseola infantum or roseola infantilis. The following is a brief summary of roseola: Cause: Roseola is caused by a virus called human herpesvirus 6 ...