Source : Webster's Revised Unabridged Dictionary (1913)

Ecphonesis \Ec`pho*ne"sis\, n. [NL., fr. Gr. ?. See
   {Ecphonema}.] (Rhet.)
   An animated or passionate exclamation.

         The feelings by the ecphonesis are very various.
                                                  --Gibbs.

Source : WordNet®

ecphonesis
     n : an exclamatory rhetorical device; "O tempore! O mores" [syn:
          {exclamation}]