The Collaborative International Dictionary of English v.0.48:

Touring car \Tour"ing car\
   An automobile designed for touring; specif., a roomy car, not
   a limousine, for five or more passengers.
   [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

touring car
    n 1: large open car seating four with folding top [syn: touring
         car, phaeton, tourer]