antistrophe (n.)

part of an ancient Greek choral ode, 1610s, from Latin, from Greek antistrophe "the returning of the chorus," "answering to a previous [strophe], except that they now moved from left to right instead of from right to left" [Liddell & Scott], literally "a turning about, a turning back," from antistrephein, from anti "opposite, in opposition to; in return" (see anti-) + strephein "to turn" (from PIE root *streb(h)- "to wind, turn"). Related: Antistrophic.