Monsieur
来自Big Physics
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French, from mon ‘my’ + sieur ‘lord’.
wiktionary
French monsieur
etymonline
monsieur (n.)
the common title of courtesy in France, equivalent to English mister, 1510s, from French monsieur, from mon sieur "my lord," from sieur "lord," shortened form of seigneur (see monseigneur) It was the historical title for the second son or next younger brother of the king of France.
