l, fib-ruh
l]
| 1. | a small or fine fiber or filament. |
| 2. | Botany. any of the delicate hairs on the young roots of some plants. |
| 3. | Cell Biology. any threadlike structure or filament. |

fibril fi·bril (fī'brəl, fĭb'rəl) or fi·bril·la (fī-brĭl'ə)
n.
A minute fiber.
| fibril (fī'brəl, fĭb'rəl) Pronunciation Key
Any of various threadlike fibers or filaments that are constituent parts of a cell or larger structure. Cellulose fibrils are the main component of cell walls in plants. Fibrils make up the contractile part of striated muscle fiber in the body. |