The Collaborative International Dictionary of English v.0.48:

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.
   [1913 Webster]

   Diogenes' crab (Zool.), 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.
      [1913 Webster]

WordNet (r) 3.0 (2006):

Diogenes
    n 1: an ancient Greek philosopher and Cynic who rejected social
         conventions (circa 400-325 BC)