four-wheeler

from WordNet (r) 3.0 (2006)

four-wheeler
    n 1: a hackney carriage with four wheels

from The Collaborative International Dictionary of English v.0.48

Four-wheeler \Four"-wheel`er\, n.
   A vehicle having four wheels; specifically, a hackney
   carriage with four weels. [Colloq.]
   [1913 Webster + WordNet 1.5]