Medical Definition of fiber
1: a thread or a threadlike structure or object: asa: a strand of nerve tissue : axon, dendriteb: one of the filaments composing most of the intercellular matrix of connective tissuec: one of the elongated contractile cells of muscle tissue
2: mostly indigestible material in food that stimulates the intestine to peristalsis—called also bulk, dietary fiber, roughage
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