HYSTERON PROTERON, in Grammar and Rhetoric, a species of the hyperbaton, wherein the proper order of construction is so inverted, that the part of any sentence which should naturally come first is placed last: as in this of Terence, Valet et vivit, for vivit et valet; and in the following of Virgil, Moriamur, et in media arma ruamus, for In media arma ruamus, et moriamur.