The Collaborative International Dictionary of English v.0.48:

bagel \ba"gel\ (b[=a]"g'l), n. [Yiddish beygl, prob. fr. dial.
   G. Beugel. --RHUD]
   a glazed leavened doughnut-shaped roll with a hard crust.

   Note: A similar roll in Russia is called a bublik.
         [WordNet 1.5 +PJC]

WordNet (r) 3.0 (2006):

bagel
    n 1: (Yiddish) glazed yeast-raised doughnut-shaped roll with
         hard crust [syn: bagel, beigel]