bluebeard

Short definition from Wiktionary

Noun

1. 1
   Any plant of the genus Caryopteris.
2. 2
   A man who marries and then murders one wife after another.

Proper noun

1. 1
   A famous fairy tale 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.
2. 2
   The nobleman who is the title character of the story.