Definition of fibril in English:



  • A small or slender fiber.

    ‘each muscle fiber is subdivided into smaller fibrils’
    • ‘All fibril dimensions were therefore estimated from the height of the fibril in cross section.’
    • ‘Collagen fibrils are important for the function of musculoskeletal biomechanics in various species.’
    • ‘The direction of cell growth is determined by the orientation of the cellulose fibrils in the cell wall.’
    • ‘Many such pairs of filaments are bundled together into a structure called a fibril, and groups of fibrils make up a single muscle fiber (cell).’
    • ‘As the number of fibrils decreases, it becomes increasingly easier to cut the next fibril because the fibrils carry larger and larger loads.’
    fibre, thread, strand, tendril
    View synonyms


Mid 17th century: from modern Latin fibrilla, diminutive of Latin fibra (see fiber).