Douglas Harper's Etymology Dictionary
Usage examples of "psycho-history".
All was arranged in such a way that the future as foreseen by the unalterable mathematics of psycho-history would involve their early isolation from the main body of Imperial civilization and their gradual growth into the germs of the Second Galactic Empire—cutting an inevitable barbarian interregnum from thirty thousand years to scarcely a single thousand.
It was he who brought the science of psycho-history to its full development.