D defs.my
Entry 3 senses Webster, 1913

Monsieur

/(F. mŏ*syẽ"; E. mŏ*sēr")/ · Mon·sieur · IPA /məˈsjʊə(ɹ)/
01 n. The common title of civility in France in speaking to, or of, a man; Mr. or Sir.
pl. Messieurs ((F. mā`syẽ" E. mĕsh"yẽrz))
  1. 1.
    The common title of civility in France in speaking to, or of, a man; Mr. or Sir.
  2. 2.
    The oldest brother of the king of France.
  3. 3.
    A Frenchman.[Contemptuous]