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fever blister

A vesicular rash usually appearing on the lips or mucous membrane of the mouth during another infectious illness. The rash is caused by herpes simplex virus. SEE: cold sore.

feverfew

(fē′vĕr-fū″) A perennial herb (Tanacetum parthenium) grown as an ornamental plant and promoted to treat rheumatism and to prevent migraines.

fexofenadine

(fĕk″sō-fĕn′ĭ-dēn) A piperidine, administered orally to treat colds and coughs, relieve symptoms of seasonal allergic rhinitis, and to manage chronic idiopathic urticaria. Its therapeutic classes are allergy, cold, and cough remedies and antihistamines.

FFB

flexible fiber-optic bronchoscope.

fFN

Fetal fibronectin.

ffNA

Free fetal nucleic acid.

FFPE

formalin-fixed, paraffin-embedded.

FFR

Fractional flow reserve.

FGM

female genital mutilation.

FGR

Fetal growth restriction.

FH4

5,6,7,8-tetrahydrofolic acid (folacin).

FHPE

Focused history and physical examination.

FHx

Family history.

fiat

(fī′ăt) [L.] Let there be made, a term used in writing prescriptions.

fiber

(fī′bĕr) [L. fibra, filament, fiber] 1. A threadlike or filmlike structure, e.g., a nerve fiber. 2. A neuron or its axonal portion. 3. An elongated threadlike structure. It may be cellular, like a nerve or muscle fiber, or it may be a cellular product, such as collagen, elastic, oxytalan, or reticular fiber. 4. A slender cellulosic structure derived from plants such as cotton. SEE: purified rayon.

A f. A heavily myelinated, fast-conducting nerve fiber.

afferent f. A nerve fiber that carries sensory impulses to the central nervous system from receptors in the periphery.

circular f. Any of the collagen bundles in the gingiva surrounding a tooth.

climbing f. An excitatory axon from the inferior olivary nucleus that synapses with dendrites of Purkinje cells in the cerebellar cortex.

dietary f. The components of food that resist chemical digestion. These fibers are classified according to their solubility in water. Foods rich in fiber include whole-grain foods, bran flakes, beans, fruits, leafy vegetables, nuts, and root vegetables and their skins. The recommended minimal daily consumption of fiber is approximately 33 g/day (for men) and 28 g/day (women).

 Water-insoluble fibers include cellulose, lignin, gums, mucilages, pectin, and some hemicelluloses. These fibers can soften and increase the bulk of the bowel movement. Most foods of plant origin contain ...

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