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From: Webster's Revised Unabridged Dictionary (1913)

 Dol·ly n.; pl. Dollies
 1. Mining A contrivance, turning on a vertical axis by a handle or winch, and giving a circular motion to the ore to be washed; a stirrer.
 2. Mach. A tool with an indented head for shaping the head of a rivet.
 3. In pile driving, a block interposed between the head of the pile and the ram of the driver.
 4. A small truck with a single wide roller used for moving heavy beams, columns, etc., in bridge building.
 5. A compact, narrow-gauge locomotive used for moving construction trains, switching, etc.