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Medical Dictionary Definitions A-Z List

Medical Dictionary Definitions A - Z - «R»:

  1. Ring vaccination Ring vaccination
    Ring vaccination: The vaccination of all susceptible individuals in a prescribed area around an outbreak of an infectious disease. Ring vaccination controls an outbreak by vaccinating and monitoring a ring of people around each infected individual. The idea is to form a buffer of immune individuals ...
  2. Ring, intrastromal corneal Ring, intrastromal corneal
    Ring, intrastromal corneal: A plastic ring designed to be implanted in the cornea, the transparent structure in the front of the eye. The aim of the corneal ring implant is to flatten the cornea and in so doing to correct or reduce the degree of myopia (nearsightedness). The ring is called an...
  3. Ringing in the ears Ringing in the ears
    Ringing in the ears: Medically called tinnitus, this can arise in any of "the four sections of the ear" -- the outer ear, the middle ear, the inner ear, and the brain -- and can be due to many causes including ear infections, fluid in the ears, Meniere syndrome (the combination of tinnitus and deafn...
  4. Ringworm (tinea) Ringworm (tinea)
    Ringworm (tinea): Ringworm is a fungal infection of the skin previously thought to be due to a parasite (worm). The medical term for ringworm is tinea. The skin infections are sometimes characterized by round lesions in the upper layers of the skin. Fungi that cause ringworm are known as dermat...
  5. Ringworm of the nails Ringworm of the nails
    Ringworm of the nails: The most common fungus infection of the nails, also called onychomycosis. Onychomycosis makes the nails look white and opaque, thickened, and brittle. Those at increased risk for developing onychomycosis include: People with diabetes; People with disease of the small blood ...
  6. Riot control agent poisoning Riot control agent poisoning
    Riot control agent poisoning: Poisoning by an irritant agent that belongs to a class of agents collectively known as riot control agents or "tear gas." Chloroacetophenone (CN), chlorobenzylidenemalononitrile (CS), chloropicrin (PS), bromobenzylcyanide (CA), dibenzoxazepine (CR), and combinations of ...
  7. RIRS (retrograde intrarenal surgery) RIRS (retrograde intrarenal surgery)
    RIRS (retrograde intrarenal surgery): Retrograde intrarenal surgery (RIRS) is a procedure for doing surgery within the kidney using a viewing tube called a fiberoptic endoscope. In RIRS the scope is placed through the urethra (the urinary opening) into the bladder and then through the ureter into t...
  8. Risk factor Risk factor
    Risk factor: Something that increases a person's chances of developing a disease....
  9. Risk of recurrence Risk of recurrence
    Risk of recurrence: In medical genetics, the chance that a genetic (inherited) disease present in a family will recur in that family. The concept in general medicine means the chance that an illness we come back again....
  10. Ritter disease Ritter disease
    Ritter disease: This is the scalded skin syndrome, a potentially serious side effect of infection with the Staph (Staphylococcus) bacteria that produces a specific protein which loosens the "cement" holding the various layers of the skin together. This allows blister formation and sloughin...
  11. River blindness River blindness
    River blindness: Onchocerciasis, a disease caused by a parasitic worm (Onchocerca volvulus) which is transmitted to persons by biting blackflies (buffalo gnats) that breed in fast-flowing rivers. The adult worms can live for up to 15 years in nodules beneath the skin and in the muscles of infected p...
  12. RLL RLL
    RLL: Acronym for the right lower lobe (of the lung). The right lung has three lobes: the right upper lobe (RUL), the right middle lobe (RML), and the right lower lobe (RLL). The left lung has but two lobes: the left upper lobe (LUL) and the left lower lobe (LLL). The reason why the right lung has t...
  13. RLQ RLQ
    RLQ: Abbreviation for the right lower quadrant (quarter) of the abdomen. The RLQ of the abdomen contains the appendix. (By contrast, RUQ stands for the right upper quadrant, LUQ stands for the left upper quadrant, and LLQ stands for the left lower quadrant.)...
  14. RML RML
    RML: Acronym for the right middle lobe (of the lung). The right lung has three lobes: the right lower lobe (RLL), the right middle lobe (RML), and the right upper lobe (RUL). The left lung has but two lobes: the left upper lobe (LUL) and the left lower lobe (LLL). The reason why the right lung has ...
  15. RMSF RMSF
    RMSF: Rocky Mountain spotted fever. ...