The leaflet of a pinna; a secondary leaflet of a pinnately decompound leaf.
                                                            
                                                     
                        
                                                
                        
                        
                        
                                                
                        
                        
                            (also pinule) - n. (NL. pinnula, fr. L., small feather, small fin) a secondary pinna, one of the ultimate divisions of a bipinnate or twice-pinnate leaf.
                                                            
                                                     
                        
                                                
                        
                        
                            division of a usually pinnately divided leaf 
                                                            
                                                     
                        
                                                
                        
                        
                            the second order of segments of a compound or dissected leaf leaf or frond
                                                            
                                                     
                        
                                                
                        
                        
                            The smallest individual leaflet of a bi-, tre-, or quadripinnate leaf. See also pinnate.
                                                            
                                                     
                        
                                                
                        
                        
                            a leaflet, i.e. ultimate segments of the lamina.
                                                            
                                                     
                        
                                                
                        
                        
                            a secondary division of a leaf or frond.
                                                            
                                                     
                        
                                                
                        
                        
                            One of the divisions of a pinnate leaflet in a bipinnate leaf.
                                                            
                                                     
                        
                                                
                        
                        
                            A segment of a blade produced by two levels of division. If a blade is once pinnate, the segments formed are pinna. Each pinna can be further divided into segments called pinnules.
                                                            
                                                     
                        
                                                
                        
                        
                            A secondary division of a fern leaf.
                                                            
                                                     
                        
                                                
                        
                        
                            Diminutive of pinnae; an ultimate leaflet of a leaf that is pinnately two or more times compound.
                                                            
                                                     
                        
                                                
                        
                        
                            one of a number of second-order leaflets in a compound leaf, such as is typical of many ferns, where the pinnae are themselves divided into leaflets
                                                            
                                                     
                        
                                                
                        
                        
                            A secondary pinna, one of the ultimate divisions of a bipinnate or twice-pinnate leaf. From the Latin, pinnula, "small feather, small fin."