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Webster's Dictionary (1865)

Monsieur, n.

noun

(mo-seer', or mōs-yūr'), n.; pl. MESSIEURS (mes-seer'). [Fr. mon, my, and sieur, abbreviation of seigneur, lord. See supra.]

  1. Sir, or mister;—a title of civility to persons addressed in speech or writing. It is used specifically of the princes of the French blood-royal.
  2. In general, a Frenchman;—so called in contempt or ridicule. Shak.