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fading

(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.

FADS

Fetal akinesia deformation sequence.

Faecalibacterium

(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.

Fagales

(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.

Fahr, Karl Theodor

(far) Ger. pathologist, 1877–1945.

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

Fahrenheit, Daniel Gabriel

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

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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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.

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).

failed back surgery syndrome

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

fail-first requirement

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

fail-safe

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