Merriam-Webster's Collegiate® Dictionary, 11th Edition
DOLLY
I. noun (plural dollies)
Date: 1790
doll , a wooden-pronged instrument for beating and stirring clothes in the process of washing them in a tub, a compact narrow-gauge railroad locomotive for moving construction trains and for switching,
4. a platform on a roller or on wheels or casters for moving heavy objects, a wheeled platform for a television or motion-picture camera,
II. verb (dollied; dollying)
Date: 1878
transitive verb to treat with a dolly, to move or convey on a dolly, intransitive verb to move a motion-picture or television camera about on a dolly while shooting a scene