retrograde
Directed or moving backwards in relation to the normal or previous direction of travel; retreating.
Other meanings
Reverting to an inferior or less developed state; declining, regressing.
Of an animal: appearing to regress to a less developed form during its lifetime.
Word history
From Latin "retrōgradus" (of a celestial object: appearing to move backwards).
Where this comes from
This definition is adapted from “retrograde” on Wiktionary, by its contributors, published under CC BY-SA 4.0. This page is published under the same licence.