| fahlband | 1. <chemical> A stratum in crystalline rock, containing metallic sulphides. Origin: G, fr. Fahl dun-coloured + band a band. 2. <chemical> Same as Tetrahedrite. Origin: G. Fahlerz; fahl dun-coloured, fallow + erz ore. (01 Mar 1998) |
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| fahlunite | <chemical> A hydration of iolite. Origin: From Falhun, a place in Sweden. (01 Mar 1998) |
| Fahr's disease | <disease> Progressive calcific deposition in the walls of blood vessels of the basal ganglia, in young to middle-aged persons; occasionally associated with mental retardation and extrapyramidal symptoms. (05 Mar 2000) |
| Fahr, Theodore | <person> German physician, 1877-1945. See: Fahr's disease. (05 Mar 2000) |
| Fahraeus, Robert Sanno | <person> Swedish pathologist, 1888-1968. See: Fahraeus-Lindqvist effect. (05 Mar 2000) |
| Fahraeus-Lindqvist effect | The decrease in apparent viscosity that occurs when a suspension, such as blood, is made to flow through a tube of smaller diameter; observed in tubes less than about 0.3 mm in diameter. Synonym: sigma effect. (05 Mar 2000) |
| Fahrenheit | <unit> A measurement of temperature commonly used in the U.S.A. Normal body temperature is considered to be 98.6 degrees Fahrenheit or 37 degrees Celsius. Body temperature can vary 1/2 to 1 degree Fahrenheit above or below 98.6 f. And still be considered normal. Body temperature varies with many factors including level of activity. To convert a Fahrenheit temperature to Celsius use: C = (F-32) x 5/9. To convert a Celsius temperature to Fahrenheit use: F = (C x 9/5) + 32 (27 Sep 1997) |
| Fahrenheit scale | A thermometer scale in which the freezing point of water is 32캟 and the boiling point of water 212캟; 0캟 indicates the lowest temperature Fahrenheit could obtain by a mixture of ice and salt in 1724; 캜 = (5/9)(캟 -32). (05 Mar 2000) |
| Fahrenheit, Gabriel | <person> German-Dutch physicist, 1686-1736. See: Fahrenheit scale. (05 Mar 2000) |