The clue "Layer of the upper atmosphere" last appeared in the New York Times crossword on March 19, 2018. The correct answer for this puzzle is "OZONE", a 5-letter word.
Solution OZONE is 5 letters long. So far we haven´t got a solution of the same word length.
There is 1 solutions. The longest is OZONE with 5 letters, and the shortest is OZONE with 5 letters.
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The solution is 5 letters long.