The Collaborative International Dictionary
Parembole
Parembole \Pa*rem"bo*le\, n. [NL., from Gr. ? an insertion beside. See Para-, and Embolus.] (Rhet.) A kind of parenthesis.
Wiktionary
parembole
n. (context rhetoric English) A kind of rhetorical parenthesis. The insertion of something relating to the subject in the middle of a period.