Definition:
Anastrophe is a form of literary device wherein the order of the noun and the adjective in the sentence is exchanged. In standard parlance and writing the adjective comes before the noun but when one is employing an anastrophe the noun is followed by the adjective. This reversed order creates a dramatic impact and lends weight to the description offered by the adjective.
Example:
He spoke of times past and future, and dreamt of things to be.
No sooner had he written it than he realized it was anastrophe.
Saying “life eternal ” instead of “eternal life” would be a good example of an anastrophe.