Definition of retrogrades:
(adj) :
Directed or moving backwards in relation to the normal or previous direction of travel; retreating.
(adj) :
Reverting to an inferior or less developed state; declining, regressing.
(adj) :
(zoology) Of an animal: appearing to regress to a less developed form during its lifetime.
(adj) :
Of the order of something: inverse, reverse.
(adj) :
(music) Having a passage of music played backwards.
(adj) :
Of ideas or a person: opposing social reform, favouring the maintenance of the status quo; conservative.