a small fixed wheel, sometimes turning in a block, with a grooved rim in which a rope or chain runs, as to raise a weight attached at one end by pulling on the other end; a pulley.

a wheel, as a part of a machine.

a circular, revolving platform with forms of animals as seats on it, used at carnivals, amusement parks, etc, operated by manual or electric power; a merry-go-round.