The Collaborative International Dictionary of English v.0.48:

bratwurst \brat"wurst\ (br[a^]t"w[^u]rst; br[a^]t"w[oo^]rst;
   br[a^]t"v[^u]rst; br[aum]t"w[^u]rst; G. br[a^]t"v[oo^]rsht),
   n. [German.]
   a small pork sausage seasoned with spices and herbs, and
   usually served broiled or sauteed.
   [WordNet 1.5 +PJC]

WordNet (r) 3.0 (2006):

bratwurst
    n 1: a small pork sausage [syn: bratwurst, brat]