Mon·sei·gneur 
(môɴ-sĕ-nyœr)
(môɴ-sĕ-nyœr)n. pl. Mes·sei·gneurs (mā-sĕ-nyœr) Abbr. Msgr. or Mgr.
Used as an honorific in French-speaking areas, especially as accorded to princes and prelates.
[French, from Old French : mon, my; see MONSIEUR + seignor, lord, sir; see SEIGNIOR.]