'Roadster' definitions:

Definition of 'roadster'

noun

An open automobile having a front seat and a rumble seat [syn: roadster, runabout, two-seater]

noun

A small lightweight carriage; drawn by a single horse [syn: buggy, roadster]

From: GCIDE

Roadster \Road"ster\, n.
1. (Naut.) A clumsy vessel that works its way from one anchorage to another by means of the tides. --Ham. Nav. Encyc. [1913 Webster]
2. A horse that is accustomed to traveling on the high road, or is suitable for use on ordinary roads. [1913 Webster]
A sound, swift, well-fed hunter and roadster. --Thackeray. [1913 Webster]
3. A bicycle or tricycle adapted for common roads rather than for the racing track. [1913 Webster]
4. One who drives much; a coach driver. [Eng.] [1913 Webster]
5. A hunter who keeps to the roads instead of following the hounds across country. [Eng. Slang.] [1913 Webster]