Main Entry: fi·ber

Variant(s): or chiefly British fi·bre \ˈfī-bər\

Function: noun

1 : a thread or a threadlike structure or object: as a : a strand of nerve tissue : axon, dendrite b : one of the filaments composing most of the intercellular matrix of connective tissue c : 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