The Collaborative International Dictionary of English v.0.48:

Bahrein \Bahrein\ n.
   an island in the Persian Gulf; same as Bahrain.

   Syn: Bahrain.
        [WordNet 1.5]

   2. an island country in the Persian Gulf.

   Syn: Bahrain.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Bahrein
    n 1: an island in the Persian Gulf [syn: Bahrain, Bahrain
         Island, Bahrein, Bahrein Island]
    2: an island country in the Persian Gulf off the coast of Saudi
       Arabia; oil revenues funded progressive programs until
       reserves were exhausted in 1970s [syn: Bahrain, State of
       Bahrain, Bahrein]