Monseigneur
Pronunciation : Mon`sei`gneur"
Part of Speech : n.;
Etymology : [F., fr. mon my + seigneur lord, L. senior older. See Senior, and cf. Monsieur.]
Definition : Defn: My lord; -- a title in France of a person of high birth or rank; as, Monseigneur the Prince, or Monseigneur the Archibishop. It was given, specifically, to the dauphin, before the Revolution of 1789. (Abbrev. Mgr.)
pl. Messeigneurs.
Source : Webster's Unabridged Dictionary, 1913