Slightly tapering at both ends.
                                                            
                                                     
                        
                                                
                        
                        
                            Smooth, cylindrical and tapering. Often used in describing vascular cells in plants (esp. xylem cells).
                                                            
                                                     
                        
                                                
                        
                        
                            Cylindric and slender, as the normal culm of a grass plant.
                                                            
                                                     
                        
                                                
                        
                        
                            cylindrical in cross-section and usually tapering (spines, joints).
                                                            
                                                     
                        
                                                
                        
                        
                            Curled from the edges to form a tapering cylinder.