Definition from Wiktionary, the free dictionary
Proper noun 
- A famous fairytale written by Charles Perrault in 1697 about a violent nobleman who has the habit of murdering his wives and the attempts of his current wife to avoid the same fate.
- The nobleman who is the title character of the story.
the famous fairytale
the title character
Bluebeard (plural Bluebeards)
- A man who married and then murdered one wife after another.
Webster's Collegiate Dictionary of the English Language, International Encyclopedic Edition, 2002.