Sulky \Sulk"y\, n.; pl. {Sulkies}. [From {Sulky}, a.; -- so
called from the owner's desire of riding alone.]
A light two-wheeled carriage for a single person.
[1913 Webster]
Note: Sulky is used adjectively in the names of several
agricultural machines drawn by horses to denote that
the machine is provided with wheels and a seat for the
driver; as, sulky plow; sulky harrow; sulky rake, etc.
[1913 Webster]