Definition of "roadster"

(archaic) A horse for riding or driving on the road.  quotations

A bicycle, or tricycle, adapted for common roads, rather than for the racing track, usually of classic style and steel-framed construction.  examples

(UK, dated) One who drives much; a coach driver.  examples

(UK, dated, slang) A hunter who keeps to the roads instead of following the hounds across country.

An open automobile having a front seat and a rumble seat.  examples

A person who lives along the road.  examples

a sea-going vessel riding at anchor in a road or bay.  examples

(nautical) A clumsy vessel that works its way from one anchorage to another by means of the tides.  examples