| reflectivity | <physics> Fraction of incident radiant energy which is reflected by a given surface. (The power which is not reflected is either absorbed or transmitted.) (09 Oct 1997) |
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| reflector | 1. One who, or that which, reflects. 2. <physics> Something having a polished surface for reflecting light or heat, as a mirror, a speculum, etc. A reflecting telescope. A device for reflecting sound. Origin: Cf. F. Reflecteur. Source: Websters Dictionary (01 Mar 1998) |
| reflex | 1. <anatomy> Reflected. 2. <neurology, physiology> A reflected action or movement, the sum total of any particular involuntary activity. (18 Nov 1997) |
| reflex angina | Angina pectoris in which the breast pain is comparatively slight, but pallor followed by cyanosis, and coldness and numbness of the extremities, are marked. Synonym: angina spuria, angina vasomotoria, pseudangina, pseudoangina, reflex angina, vasomotor angina. (05 Mar 2000) |
| reflex arc | The route followed by nerve impulses in the production of a reflex act, from the peripheral receptor organ through the afferent nerve to the central nervous system synapse and then through the efferent nerve to the effector organ. (05 Mar 2000) |
| reflex asthma | Asthma occurring as a reflex in disease of the viscera, the nose, or other parts. (05 Mar 2000) |
| reflex control | Nerve impulses transmitted to the muscles to maintain normal reflex action. (05 Mar 2000) |
| reflex cough | A cough excited reflexly by irritation in some distant part, as the ear or the stomach. (05 Mar 2000) |
| reflex detrusor contraction | Normal coordinated function of the bladder with sustained contractions of the bladder matched by simultaneous relaxation of the sphincteric outlet mechanisms to empty the bladder. (05 Mar 2000) |
| reflex dyspepsia | Functional dyspepsia excited by reflex irritation from disease elsewhere than in the stomach or intestines. (05 Mar 2000) |
| reflex epilepsy | Seizures which are induced by peripheral stimulation; e.g., audiogenic, laryngeal, photogenic, or other stimulation. Synonym: sensory precipitated epilepsy. (05 Mar 2000) |
| reflex headache | A headache secondary to another organic condition. Synonym: reflex headache. (05 Mar 2000) |
| reflex incontinence | In neurogenic disorders, loss of urine due to detrusor hyperreflexia and/or involuntary urethral relaxation in the absence of the desire to void. (05 Mar 2000) |
| reflex inhibition | A situation in which sensory stimuli decrease reflex activity. (05 Mar 2000) |
| reflex iridoplegia | Absence of the pupillary light reflex, as in the Argyll Robertson pupil. (05 Mar 2000) |
Synonyms : Babinski Reflexes, Babinski Sign, Babinski Sign Absent, Babinski Sign Negative, Babinski Sign Positive, Babinski's Reflex, Babinski's Sign, Extensor Plantar Reflex, Great Toe Paradoxical Extensor Reflex, Reflexes, Babinski, Babinski Signs, Babinski's Signs
Synonyms : Monosynaptic Reflex
Synonyms : Oculocardiac Reflex
Synonyms : Pupillary Reflex
Synonyms : Stretch Reflex, Tendon Reflex
| refrigerate |
preserve by chilling; "many foods must be refrigerated or else they will spoil" cool or chill in or as if in a refrigerator; "refrigerate this medicine"
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| refraction |
the change in direction of a propagating wave (light or sound) when passing from one medium to another deflection: the amount by which a propagating wave is bent
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| refractive index |
the ratio of the velocity of light in a vacuum to that in a medium
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| refractory |
not responding to treatment; "a stubborn infection"; "a refractory case of acne"; "stubborn rust stains" temporarily unresponsive or not fully responsive to nervous or sexual stimuli; "the refractory period of a muscle fiber" furnace lining: lining consisting of material with a high melting point; used to line the inside walls of a furnace fractious: stubbornly resistant to authority or control; "a fractious animal that would not submit to the harness"; "a refractory child"
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| refresh |
review: refresh one's memory; "I reviewed the material before the test" make (to feel) fresh; "The cool water refreshed us" freshen: become or make oneself fresh again; "She freshened up after the tennis game" make fresh again
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| REF | a book to which you can refer for authoritative facts |
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| REF | a formal recommendation by a former employer to a potential future employer describing the person's qualifications and dependability |
| REF | a short note recognizing a source of information or of a quoted passage |
| REF | a remark that calls attention to something or someone |
| REF | an indicator that orients you generally |
| REF | a publication (or a passage from a publication) that is referred to |
| REF | refer to |
| REF | a book to which you can refer for authoritative facts |
| REF | a system that uses coordinates to establish position |
| REF | a network of horizontal and vertical lines that provide coordinates for locating points on an image |
| REF | a manual containing information organized in a summary manner |
| REF | an indicator that orients you generally |