Definition of fibril in English:



  • A small or slender fibre.

    ‘each muscle fibre is subdivided into smaller fibrils’
    • ‘Collagen fibrils are important for the function of musculoskeletal biomechanics in various species.’
    • ‘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).’
    • ‘All fibril dimensions were therefore estimated from the height of the fibril in cross section.’
    • ‘The direction of cell growth is determined by the orientation of the cellulose fibrils in the cell wall.’
    • ‘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 fibre).