Category: F
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Film dressing
A transparent wound covering, made of polyurethane, that enables health care providers to visually inspect an injured part as it heals. The dressing allows water vapor to escape from the wound but does not permit liquids or bacteria to enter.
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False diverticulum
A diverticulum without a muscular coat in the wall or pouch. This type of diverticulum is acquired.
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Fractional distillation
Separation of liquids based on the difference in their boiling points.
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Focus film distance
An obsolete term for source-to-image receptor distance.
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Figure-ground discrimination
The ability to see the outline of an object as distinct from visually competing background stimuli. This ability is often impaired following central nervous system damage.
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Fluid diet
A nutritional plan (also known as a liquid diet) for persons unable to chew and swallow solid food or for patients whose gastrointestinal tract must be free of solid matter. Fluiddiets are often prescribed postoperatively.
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Factitious diarrhea
Self-induced diarrhea. This can be accomplished, for example, by self-medication with laxatives.
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Frontomental diameter
The distance from the top of the forehead to the point of the chin.
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Flat panel image detector
An image detector, usually composed of selenium or silicon, that is used in digital radiography to convert x-rays into light or an electronic signal.
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Flame ionization detector
A device used in gas chromatography in which a sample burned in a flame changes the conductivity between two electrodes.