Related Clues:
- Head of a household, maybe
- President's address we've yet to hear?
- Old letter opener
- No longer common letter opener
- Letter starter
- Term of respect
- Start of a famous palindrome
- Business salutation, sometimes
- Elton John and others
- My brothel's keeper
- Knights
- Knights of the Round Table
- Address for a lady
- Respectful address
- Sir's analogue