CESIUM
Set to 4 different clues across 4 published puzzles, most often “Element in photoelectric cells” — The New York Times, Friday, 13 April 2007.
6 letters
Every clue on record, most used first
- Element in photoelectric cellsonce
The New York Times — Friday, 13 April 2007
- Highly reactive metalonce
The New York Times — Sunday, 20 March 2005
- Photoelectric cell elementonce
The New York Times — Wednesday, 10 July 1996
- Photoelectric cell componentonce
The New York Times — Tuesday, 4 June 1996