| refractive keratotomy | Modification of corneal curvature by means of corneal incisions to minimise hyperopia, myopia, or astigmatism.In this type of radial keratotomy surgery, performed by excimer laser, pie-shaped pieces of cornea are removed under local anaesthetic. The resulting scar tissue formation reshapes the cornea. This class of surgery is somewhat unpredictable, and its long-term effects are still unknown. (05 Mar 2000) |
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| refractivity | Refractive power. Synonym: refringency. (05 Mar 2000) |
| refractometer | <optics> A contrivance for exhibiting and measuring the refraction of light. Origin: Refraction. Source: Websters Dictionary (01 Mar 1998) |
| refractometry | Measurement of the index of refraction (the ratio of the velocity of light or other radiation in the first of two media to its velocity in the second as it passes from one into the other). (12 Dec 1998) |
| refractor | <optics> Anything that refracts; specifically: A refracting telescope, in which the image to be viewed is formed by the refraction of light in passing through a convex lens. Source: Websters Dictionary (01 Mar 1998) |
| refractory | Not readily yielding to treatment. Origin: L. Refractorius (18 Nov 1997) |
| refractory anaemia | <haematology> A form of myelodysplasia which primarily affects the red cell production by the bone marrow. In some cases the developing red cells show an internal ring of iron granules. These cells are called sideroblasts. Refractory anaemia and refractory anaemia with sideroblasts are the most common forms of myelodysplasia. Origin: Gr. Haima = blood (13 Nov 1997) |
| refractory anaemia with excess blasts | <haematology> A form of myelodysplasia characterised by the build up of immature white blood cells (blasts) in the bone marrow. If the immature cells are particularly numerous it may indicate a chance of transformation to acute leukaemia and the condition is called refractory anaemia with excess blasts in transformation (RAEBt). Acronym: RAEB (13 Nov 1997) |
| refractory cast | A cast made of material that will withstand the high temperatures of metal casting or soldering without disintegrating. Synonym: investment cast. (05 Mar 2000) |
| refractory flask | A metal tube in which a refractory mold is made for casting metal dental restorations or appliances. Synonym: casting flask, casting ring. (05 Mar 2000) |
| refractory lining | A lining, usually of ceramic, capable of resisting and maintaining high temperatures. (05 Dec 1998) |
| refractory period | <neurology, physiology> most commonly used in reference to the interval (typically 1ms) after the passage of an action potential during which an axon is incapable of responding to another. This is caused by inactivation of the sodium channels after opening. The maximum frequency at which neurons can fire is thus limited to a few hundred Hertz. An analogous refractory period occurs in individuals of Dictyostelium discoideum, which are insensitive to extracellular cyclic AMP immediately after a pulse of cAMP has been secreted. The term can be applied to any system where a similar insensitive period follows stimulation. (18 Nov 1997) |
| refractory period of electronic pacemaker | The time required to restore full sensitivity after detecting cardiac activity or delivering a pacing impulse. (05 Mar 2000) |
| refractory period, psychological | A delayed response interval occurring when two stimuli are presented in close succession. (12 Dec 1998) |
| refractory rickets | Rickets that does not respond to treatment with usual doses of vitamin D and adequate dietary calcium and phosphorus. Most often due to inherited renal tubular disorder e.g., Fanconi syndrome. Renal rickets, a form of rickets occurring in children in association with and apparently caused by renal disease with hyperphosphatemia. Synonym: pseudorickets, renal fibrocystic osteosis, renal infantilism, renal osteitis fibrosa. (05 Mar 2000) |
| refractory |
In medicine, describes a disease or condition that does not respond to treatment.
출처: www.stjude.org/glossary
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| reflex action |
a response, often involuntary, resulting from the passage of excitation potential from a receptor to a muscle or gland, over a reflex arc.
출처: www.merckmedicus.com/pp/us/hcp/thcp_dorlands_conte...
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| refractory period |
The period following orgasm during which the male cannot be sexually aroused.
출처: highered.mcgraw-hill.com/sites/0072986360/student_...
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| refine |
to change a conjecture slightly so that it is true
출처: library.thinkquest.org/2647/geometry/glossary.htm
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| reflected |
to throw or bend back from a surface
출처: library.thinkquest.org/J0111360/glos.html
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| REF | reflect deeply on a subject |
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| REF | give evidence of the quality of |
| REF | give evidence that someone has acted in a certain way |
| REF | to throw or bend back or reflect (from a surface) |
| REF | manifest or bring back |
| REF | be bright by reflecting or casting light |
| REF | the fraction of radiant energy that is reflected from a surface |
| REF | (especially of incident sound or light) bent or sent back |
| REF | causing reflection or having a device that reflects |
| REF | optical telescope consisting of a large concave mirror that produces an image that is magnified by the eyepiece |
| REF | the image of something as reflected by a mirror (or other reflective material) |
| REF | a likeness in which left and right are reversed |