intermeddler

in·ter·med·dle

I0190600 (ĭn′tər-mĕd′l)intr.v. in·ter·med·dled, in·ter·med·dling, in·ter·med·dles To interfere in the affairs of others, often officiously; meddle.
[Middle English entermedlen, from Old French entremedler : entre-, between (from Latin inter-; see inter-) + medler, to mix; see meddle.]
in′ter·med′dler n.

intermeddler

(ˌɪntəˈmɛdələ) na person who intermeddles