The Collaborative International Dictionary of English v.0.48:

Bull terrier \Bull" ter`ri*er\, bullterrier
\bull"ter`rier\(b[.u]l" t[e^]r`r[i^]*[~e]r). (Zool.)
   A breed of short-haired terrier dogs originated in England by
   crossing the bulldog and the terrier.
   [1913 Webster]

WordNet (r) 3.0 (2006):

bull terrier
    n 1: a powerful short-haired terrier originated in England by
         crossing the bulldog with terriers [syn: bullterrier,
         bull terrier]