HAPAX
Set to 2 different clues across 2 published puzzles, most often “___ legomenon (word or phrase used only once in a document or corpus)” — The New York Times, Saturday, 22 March 2008.
5 letters
Every clue on record, most used first
- ___ legomenon (word or phrase used only once in a document or corpus)once
The New York Times — Saturday, 22 March 2008
- ___ legomenon (word that appears only once in a manuscript)once
The New York Times — Sunday, 12 September 1999