in·ter·ject 
(ĭn′tər-jĕkt)
(ĭn′tər-jĕkt)tr.v. in·ter·ject·ed, in·ter·ject·ing, in·ter·jects
1. To say or mention suddenly, often in interrupting the remarks of another: "I disagree," she interjected.
2. To insert between other elements; interpose: interjected some new images into the presentation. See Synonyms at introduce.
3. To assert (oneself) in a situation in which one has not previously been involved.
[Latin intericere, interiect- : inter-, inter- + iacere, to throw; see yē- in the Appendix of Indo-European roots.]
in·ter·jector n.
in′ter·jecto·ry (-jĕktə-rē) adj.