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FAD

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flavin adenine dinucleotide.

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fading

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(fād′ing) 1. In electronics, signal attenuation. 2. Gradual loss of strength or intensity; degeneration. 3. In education, the stepwise withdrawal of instructional prompts to determine whether a student can perform a new skill on his own.

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FADS

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Fetal akinesia deformation sequence.

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Faecalibacterium

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(fē″kă-lē-bak″tēr′ē-ŭm) [L. faex, sediment, dregs + bacterium] A genus of gram-negative rod-shaped commensal bacteria that live in the gastrointestinal tract.

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Fagales

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(fă-gā′lēz″) [L. fagus, beech] An order of flowering trees and shrubs that includes the families of the alder, birch (Betulaceae), and hazel. The pollen from such trees causes hay fever, principally in the early spring.

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Fahr, Karl Theodor

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(far) Ger. pathologist, 1877–1945.

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F.'s syndrome A rare autosomal dominant movement disorder caused by the abnormal accumulation of calcium in the basal ganglia and the cerebral cortex.

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Fahrenheit, Daniel Gabriel

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(far′ĕn-hīt″) Ger.-Dutch physicist, 1686–1736.

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F. scale ABBR: F. A temperature scale with the freezing point of water at 32° and the boiling point at 212° . SEE: table; Celsius 1scale; Kelvin 1scale.

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Table Graphic Jump Location
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Fahrenheit and Celsius Scales*
F C F C F C
500° 260° 203° 95° 98° 36.67°
401 205 194 90 97 36.11
392 200 176 80 96 35.56
383 195 167 75 95 35
374 190 140 60 86 30
356 180 122 50 77 25
347 175 113 45 68 20
338 170 110 43.3 50 10
329 165 109 42.8 41 5
320 160 108 42.2 32 0
311 155 107 41.7 23 –5
302 150 106 41.1 14 –10
284 140 105 40.6 5 –15
275 135 104 40.0 –4 –20
266 130 103 39.4 –13 –25
248 120 102 38.9 –22 –30
239 115 101 38.3 –40 –40
230 110 100 37.8 –76 –60
212 100 99 37.2
*

To convert a Fahrenheit temperature to degrees Celsius, subtract 32 and multiply by 5/9. To convert a Celsius temperature to degrees Fahrenheit, multiply by 9/5 and add 32.

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F. thermometer A thermometric scale used in many English-speaking countries in which the boiling point is 212°F and the freezing point is 32°F. SEE: tables at Celsius thermometer under Celsius, Anders).

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failed back surgery syndrome

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Persistent or recurring low back pain (with or without sciatic symptoms) in patients who have undergone one or more surgeries on a lumbar disk.

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fail-first requirement

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A method of drug plan formulary control in which a patient must try a less expensive drug before being prescribed a more expensive one.

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