aphantasia
noun
                                                                                                                            
                                                            aph·an·ta·sia
                    
                                                                                                              
                                                                                                                                  ˌa-ˌfan-ˈtā-zh(ē-)ə 
                                                      
                                                          
            
                                
              
          
                                                      : the inability to form mental images of real or imaginary people, places, or things                                      
              
                             
Derek has a condition called aphantasia, which means he is unable to voluntarily produce mental imagery.—
Brooke McAfee
                         
                
                    Love words? Need even more definitions?
  
  Merriam-Webster unabridged




Share