AXION
Set to 2 different clues across 2 published puzzles, most often “Hypothetical fundamental particle” — The New York Times, Thursday, 18 November 2010.
5 letters
Every clue on record, most used first
- Hypothetical fundamental particleonce
The New York Times — Thursday, 18 November 2010
- Hypothetical physics particleonce
The New York Times — Saturday, 18 July 1998