The Collaborative International Dictionary of English v.0.48:

Epanodos \E*pan"o*dos\, n. [L., fr. Gr. ? a rising, return;
   'epi` + ? a way up, rising; ? up + ? way.] (Rhet.)
   A figure of speech in which the parts of a sentence or clause
   are repeated in inverse order, as in the following:
   [1913 Webster]

         O more exceeding love, or law more just?
         Just law, indeed, but more exceeding love! --Milton.
   [1913 Webster]

WordNet (r) 3.0 (2006):

epanodos
    n 1: recapitulation of the main ideas of a speech (especially in
         reverse order)
    2: repetition of a group of words in reverse order