Definition of cyclers:
(n) :
Anything with a cyclic (repetitious) behaviour. Something that cycles between different states.
(n) :
(psychology, euphemistic) A person with bipolar disorder, often used when comparing the speed of mood swings.
(n) :
(medicine) A device for performing dialysis; for mechanically purifying blood.
(n) :
(computing) A task in a cycle of tasks where the status of being active task is passed around the loop.
(n) :
(astronomy) An orbit that approaches two astronomical bodies on a regular basis.
(n) :
(astronautics, by extension) A, usually man-made, object that follows such an orbit.