Word Study
    megalethoscope
CIDE DICTIONARY
megalethoscope, n. [Mega- + alethoscope.]. 
                                            
                                         An optical apparatus in which pictures are viewed through a large lens with stereoptical effects.  It is often combined with the stereoscope.                                                                                 [1913 Webster]                                                                                                                    
                                                                                    
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