Category: R

To restore strength; to relieve from fatigue; to renew; to revive.  

In the World Health Organization classification of myelodysplastic syndromes, a disorder in which two or more blood cell lines form aberrantly. For example, the peripheral blood shows evidence of anemia and leukopenia, or of anemia, leukopenia, and thrombocytopenia; and the bone marrow shows abnormal precursors in two or more mature blood cell precursors.  

The quality of being refractive; the ability to refract.  

The degree to which a transparent body deflects a ray of light from a straight path.  

The structures of the eye that deflect light: the cornea, aqueous, crystalline lens, and vitreous.  

A person skilled in determining and correcting ocular refractive errors.  

The refraction brought about by the refractive media of the eye (cornea, aqueous humor, crystalline lens, vitreous body).  

Deflection from a straight path, as of light rays as they pass through media of different densities; the change in direction of a ray when it passes from one medium to another of a different density.  

The acid, gas, and liquid that rise from the upper gastrointestinal tract into the esophagus in gastroesophageal reflux disease. Its components may include gastric acids, bile, and pepsin.  

A laboratory test that is automatically obtained when the results of a screening test indicate the need for further study. Examples of reflex tests include determination of the antibiotic sensitivity of bacteria that are identified in culture specimens; and determination of an enzyme immunoassay test for HIV when an antibody test for the virus is…