Definify.com
Webster 1913 Edition
Bluebeard
Blue′beard
,Noun.
The hero of a mediæval French nursery legend, who, leaving home, enjoined his young wife not to open a certain room in his castle. She entered it, and found the murdered bodies of his former wives. – Also used adjectively of a subject which it is forbidden to investigate.
The
Bluebeard
chamber of his mind, into which no eye but his own must look. Carlyle.