gaolbird

from WordNet (r) 3.0 (2006)

gaolbird
    n 1: a criminal who has been jailed repeatedly [syn: {jail
         bird}, {jailbird}, {gaolbird}]

from The Collaborative International Dictionary of English v.0.48

gaolbird \gaolbird\ n.
   a person serving a prison sentence; a jail bird. [Chiefly
   Brit.]

   Syn: convict, inmate, jailbird, jail bird.
        [WordNet 1.5]