The Collaborative International Dictionary of English v.0.48:

bedsitter \bed"sit*ter\ n.
   a furnished sitting room with sleeping accommodations (and
   some plumbing).

   Syn: bedsitting room, bedsit.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

bedsitter
    n 1: a furnished sitting room with sleeping accommodations (and
         some plumbing) [syn: bedsitting room, bedsitter,
         bedsit]