Monsieur
Concise Oxford English Dictionary © 2008 Oxford University Press:
Monsieur /məˈsjəː/
▶noun (pl. Messieurs /mɛˈsjəː/) a title or form of address for a French-speaking man, corresponding to Mr or sir.
– origin Fr., from mon ‘my’ + sieur ‘lord’.
'Monsieur' also found in these Oxford entries:

