(anatomy) A single cell of a muscle; each muscle fiber contains many myofibrils, the contractile unit of muscles.

(anatomy) The slowest of the nerve fibers, unique in being unmyelinated

plural of C fiber

An organic fiber that is obtained naturally, notably from a plant or animal.

(US) Alternative spelling of moral fibre

plural of optical fiber

plural of Tampico fiber

A tough vegetable fiber from plants of genus Agave, especially Agave lechuguilla, used as a substitute for animal bristles in making brushes.

plural of Purkinje fiber

(anatomy, cardiology) One of a group of fibers in the heart, consisting of specialized cardiomyocytes, that allow the heart's conduction system to create synchronized contractions of its ventricles and thus maintain a consistent rhythm.