IPA: /ɪnˈtrɒmɪtə/
KK: /ɪnˈtrɒmɪtə/
A person who introduces or brings something into a situation or context.
The intromitter of the new policy explained its benefits to the team.
Intromitter is formed from "intro-" (meaning into) and "mittere" (meaning to send). The word describes someone who sends something into a place or situation.
Think of someone 'sending' ('mittere') something 'into' ('intro-') a new environment — that's what an intromitter does.