Bluebeard
Blue·beard
Bluebeard
n.
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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.