AMNION
Set to 3 different clues across 5 published puzzles, most often “Embryonic sac” — The New York Times, Saturday, 3 February 2007.
6 letters
Every clue on record, most used first
- Embryonic sac3 times
The New York Times — Saturday, 3 February 2007
- Protective membraneonce
The New York Times — Sunday, 19 December 2010
- Embryonic membraneonce
The New York Times — Thursday, 21 February 2008