FERRO
Set to 3 different clues across 3 published puzzles, most often “Prefix in some alloy names” — The New York Times, Saturday, 4 August 2001.
5 letters
Every clue on record, most used first
- Prefix in some alloy namesonce
The New York Times — Saturday, 4 August 2001
- Prefix with magneticonce
The New York Times — Friday, 16 June 2000
- Iron: Prefixonce
The New York Times — Saturday, 6 August 1994