—used as a conventional title of courtesy except when usage requires the substitution of a title of rank or an honorific or professional title before a man's surname
—used in direct address as a conventional title of respect before a man's title of office
—used as part of the title for a man who has won a contest
—used before the name of a place, profession, or activity or before an epithet (such as clever) to form a title applied to a male viewed as representative of the thing indicated
milliroentgen
—used as a title before a man's last name or title of office
—used to form a title for a man who represents the thing indicated
magnetic resonance