Vehement Insertion of One Word Inside Another

This page is the CodyCross answer for the clue below from House of Horrors, Group 1104, Puzzle 4 (Unwanted Visitors).

Question is: Vehement Insertion of One Word Inside Another

and the answer is: TMESIS

Word Meaning:

TMESIS — (prosody, rhetoric) The insertion of one or more words between the components of a compound word.

Definitions from Wiktionary.