CONCAVE
Set to 2 different clues across 2 published puzzles, most often “Like the inside of a sphere” — The New York Times, Sunday, 24 February 2008.
7 letters
Every clue on record, most used first
- Like the inside of a sphereonce
The New York Times — Sunday, 24 February 2008
- Like some lensesonce
The New York Times — Sunday, 24 May 1998