The Collaborative International Dictionary of English v.0.48:

Hosteler \Hos"tel*er\, n. [See Hostel, and cf. Hostler.]
   1. The keeper of a hostel or inn.
      [1913 Webster]

   2. A student in a hostel, or small unendowed collede in
      Oxford or Cambridge. [Obs.] --Fuller.
      [1913 Webster]