From WordNet (r) 2.0 (August 2003) [wn]:
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]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Superman \Su"per*man`\, n.
1. same as Overman, above.
[Webster 1913 Suppl.]
2. a fictional character of cartoons, movies and television,
with superhuman powers such as great strength, the ability
to fly, and x-ray vision. In the cartoon tale, he was born
on the planet Krypton and sent by his parents into space
before it exploded, and landed on earth, where he fights
for "truth, justice, and the American way". He works
incognito as a reporter at the Daily Planet, and is
constantly trying to avoid the uncovering of his secret
identity by a co-worker, Lois Lane.
[PJC]