a very slender natural or synthetic fiber 
                                                            
                                                     
                        
                                                
                        
                        
                            A linear pattern in the H-alpha chromosphere of the Sun, as seen through an H-alpha filter, occurring near strong sunspots and plages or in filament channels.
                                                            
                                                     
                        
                                                
                        
                        
                            Thread-like element unraveled from the fibre wall.
                                                            
                                                     
                        
                                                
                        
                        
                            A small filament or fiber.
                                                            
                                                     
                        
                                                
                        
                        
                            A threadlike component of cell walls, visible under a light microscope. - Category: Guitar Repair/Building
                                                            
                                                     
                        
                                                
                        
                        
                            A tiny threadlike element of a synthetic or natural fiber.
                                                            
                                                     
                        
                                                
                        
                        
                            Fibril is a fine fiber approximately 1 nm in diameter.