epanorthosis

from WordNet (r) 3.0 (2006)

epanorthosis
    n 1: immediate rephrasing for intensification or justification;
         "Seems, madam! Nay, it is"

from The Collaborative International Dictionary of English v.0.48

Epanorthosis \Ep`an*or*tho"sis\, n. [L., fr. Gr. ?; 'epi` + ? to
   set right again; ? again + ? to set straight.]
   A figure by which a speaker recalls a word or words, in order
   to substitute something else stronger or more significant;
   as, Most brave! Brave, did I say? most heroic act!
   [1913 Webster]