Source : Webster's Revised Unabridged Dictionary (1913)

Superman \Su"per*man`\, n.
   = {Overman}, above.

Source : WordNet®

superman
     n 1: a person with great powers and abilities [syn: {demigod}, {Ubermensch}]
     2: street name for lysergic acid diethylamide [syn: {acid}, {back
        breaker}, {battery-acid}, {dose}, {dot}, {Elvis}, {loony
        toons}, {Lucy in the sky with diamonds}, {pane}, {window
        pane}, {Zen}]