Definition of pacers:
(n) :
One who paces.
(n) :
In harness racing, a horse with a gait in which the front and back legs on one side take a step together alternating with the legs on the other side; as opposed to a trotter.
(n) :
A pacemaker (one who sets the pace in a race).
(n) :
A timer in an electric toothbrush that indicates how long the user should spend brushing in each part of the mouth.
(n) :
(Australia) A mechanical pencil.
(n) :
(rail transport) A British lightweight railbus diesel multiple unit of class 140, 141, 142, 143 or 144.