The clue "Gas in flashtubes" last appeared in the The Washington Post crossword on July 29, 2019. The correct answer for this puzzle is "XENON", a 5-letter word.
Solution XENON is 5 letters long. So far we haven´t got a solution of the same word length.
There is 1 solutions. The longest is XENON with 5 letters, and the shortest is XENON with 5 letters.
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The solution is 5 letters long.