Category: D

  • Dental ridge

    The raised junction between two planes meeting on the surface of a tooth.  

  • Duration of response

    In cancer care, the time between an initial response to therapy and subsequent disease progression or relapse.  

  • Durable response

    In cancer care, a long-lasting positive reaction to tumor therapy, usually lasting at least a year.  

  • Direct respiration

    Respiration in which an organism, such as a one-celled ameba, secures its oxygen and gives up carbon dioxide directly to the surrounding medium.  

  • Decreased respiration

    Respiration at less than a normal rate for the individual’s age. In adults, a respiratory rate of less than 12 breaths per minute. Slower than normal respiratory rates occur after opiate or sedative use, during sleep, in coma, and many other conditions, and may result in respiratory failure or carbon dioxide retention.  

  • Driver rehabilitation

    Specialized assistance provided to individuals who need to increase their skills and abilities to enable greater safety or independence in driving because of physical, cognitive, or perceptual deficits. Services typically include clinical assessment, assistance with seating and positioning, simulated driving practice, on-road evaluation and training, passenger car evaluation, and recommendations for vehicle modifications.  

  • Duodenal regurgitation

    A return flow of chyme from the duodenum to the stomach.  

  • Dynamic refraction

    The static refraction of the eye plus that accomplished by accommodation; the reciprocal of the near-point distance.  

  • Double refraction

    Possession of more than one refractive index, resulting in a double image.  

  • Delta ray

    Highly penetrative waves emitted by radioactive substances. Any secondary ionizing particle expelled due to recoil when a primary ionizing particle traverses through a substance.