The Collaborative International Dictionary of English v.0.48:

Epistrophe \E*pis"tro*phe\, n. [L., from Gr. ? a turning toward,
   return, fr. ? to turn toward; 'epi` upon, to + ? to turn.]
   (Rhet.)
   A figure in which successive clauses end with the same word
   or affirmation; e. g., "Are they Hebrews? so am I. Are they
   Israelites? so am I." --2 Cor. xi. 22.
   [1913 Webster]

WordNet (r) 3.0 (2006):

epistrophe
    n 1: repetition of the ends of two or more successive sentences,
         verses, etc. [syn: epiphora, epistrophe]