retinula
noun
                                                                                                                            
                                                            re·tin·u·la
                    
                                                                                                              
                                                                                                                                  re-ˈtin-yə-lə  
                                                      
                                                          
            
            
               plural retinulae
                                        re-ˈtin-yə-ˌlē  
                                    
    -ˌlī
    
 also retinulas            
        
                                
              
          
                                                      : the neural receptor of a single facet of an arthropod compound eye                                      
                
                    
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  Merriam-Webster unabridged




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