Enter a clue or pattern or both:
The Clue
Dark matter? (9 letter answer)
The Answer
ESOTERICA
Tags
Notes
The answer ESOTERICA is rarely seen, appearing only about once every 1800 puzzles.
Related Clues
Brain clutter
In-group's secrets
Recondite matters
Abstruse facts or things
Crossword topics, often
It's hard to understand
Definition
ESOTERICA as a noun:
1. secrets known only to an initiated minority