'Four-wheeler' definitions:

Definition of 'four-wheeler'

From: WordNet
noun
A hackney carriage with four wheels

Definition of 'Four-wheeler'

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