Emily Dickinson Lexicon

HY-PAL'LA-GE, n. [hypal'lagy; Gr. υπαλλαγη, change, from υπαλλασσω; υπο and αλλασσω, to change.]

In grammar, a figure consisting of a mutual change of cases. Thus in Virgil, dare classibus austros, for dare classes austris. Hypallage is a species of hyperbaton.