ELECTRON
Set to 2 different clues across 3 published puzzles, most often “Kind of microscope” — The New York Times, Wednesday, 16 May 2001.
8 letters
Every clue on record, most used first
- Kind of microscope2 times
The New York Times — Wednesday, 16 May 2001
- Subatomic bitonce
The New York Times — Monday, 16 October 2000