CERIUM
Set to 2 different clues across 2 published puzzles, most often “Metal that may ignite if scratched” — The New York Times, Sunday, 13 January 2008.
6 letters
Every clue on record, most used first
- Metal that may ignite if scratchedonce
The New York Times — Sunday, 13 January 2008
- One of the lanthanidesonce
The New York Times — Thursday, 13 February 1997