Source : Webster's Revised Unabridged Dictionary (1913)

Diogenes \Di*og"e*nes\, n.
   A Greek Cynic philosopher (412?-323 B. C.) who lived much in
   Athens and was distinguished for contempt of the common aims
   and conditions of life, and for sharp, caustic sayings.

   {Diogenes' crab} (Zo["o]l.), a species of terrestrial hermit
      crabs ({Cenobita Diogenes}), abundant in the West Indies
      and often destructive to crops.

   {Diogenes' tub}, the tub which the philosopher Diogenes is
      said to have carried about with him as his house, in which
      he lived.

Source : WordNet®

Diogenes
     n : an ancient Greek philosopher and Cynic who rejected social
         conventions (circa 400-325 BC)