| phylum of green, nonvascular, seedless plants comprised of true mosses, hornworts and liverworts |
| plants with true roots, stems and leaves dispersed by spores because they don't produce seeds |
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. |