Trolley \Trol"ley\, Trolly \Trol"ly\, n.
   (a) A form of truck which can be tilted, for carrying railroad materials, or the like. [Eng.]


   (b) A narrow cart that is pushed by hand or drawn by an animal. [Eng.]


   (c) (Mach.) A truck from which the load is suspended in some kinds of cranes.
   (d) (Electric Railway) A truck which travels along the fixed conductors, and forms a means of connection between them and a railway car.

Source: Webster's Revised Unabridged Dictionary (1913)