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The Clue

Gas in fluorescent lamps (7 letter answer)

The Answer

KRYPTON

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Notes

The answer KRYPTON is so rare that it appears less than once every 2500 puzzles.

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Definition

KRYPTON as a noun:

1. (krypton, Kr, atomic number 36) = a colorless element that is one of the six inert gasses; occurs in trace amounts in air