There is a class of transformations in physics called "orthochronous", meaning that they preserve the direction of time's flow. ("Ortho-" from the Greek for 'straight' or 'right'?) As far as I am aware, while there is no word for the opposite---a transformation that reverses time's flow---there is certainly such a concept. So I need the word to describe that concept, and I can easily think of two possibilities. But I am unclear about the distinctions between them.
- Heterochronous. ("Hetero-" from the Greek for 'other'?)
- Parachronous. ("Para-" from the Greek for 'amiss', 'irregular', or 'distinct from'?)
I would lean toward hetero-, but I'm not entirely sure why. My attempts at establishing the Greek origins are amateurish and tentative, of course.
Is there a strong distinction between these two options? If so, which best describes my desired usage; if not, should I just pick one at random?
(I'm also entirely open to better options.)