The Collaborative International Dictionary of English v.0.48:

Ecbole \Ec"bo*le\ ([e^]k"b[-o]*l[=e]), n. [NL., fr. Gr. 'ekbolh`
   a throwing out, a digression, fr. 'ekba`llein to throw out;
   'ek out of + ba`llein to throw.] (Rhet.)
   A digression in which a person is introduced speaking his own
   words.
   [1913 Webster]