Learn how to say Monseigneur correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word Monseigneur:
noun (plural Messeigneurs /ˌmɛsɛnˈjəː, mesɛɲœʀ/)
a title or form of address used of or to a French-speaking prince, cardinal, archbishop, or bishop.
French, from mon ‘my’ + seigneur ‘lord’