The Collaborative International Dictionary of English v.0.48:

bruin \bru"in\, n. [D. bruin brown. In the epic poem of "Reynard
   the Fox" the bear is so called from his color. See Brown,
   a.]
   A bear; -- so called in popular tales and fables.
   [1913 Webster]

WordNet (r) 3.0 (2006):

bruin
    n 1: a conventional name for a bear used in tales following
         usage in the old epic `Reynard the Fox'
    2: large ferocious bear of Eurasia [syn: brown bear, bruin,
       Ursus arctos]

The Free On-line Dictionary of Computing (19 January 2023):

BRUIN

   Brown University Interactive Language.

   A simple interactive language with PL/I-like syntax, for
   IBM 360.

   ["Meeting the Computational Requirements of the University,
   Brown University Interactive Language", R.G. Munck, Proc 24th
   ACM Conf, 1969].

   (1995-02-14)