Diner sign filler (7 letters) — Crossword Helper

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The Clue

Diner sign filler (7 letter answer)

The Answer

NEONGAS

Tags

dark diner filler glow may neonga sign some substance

Notes

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

Related Clues

Substance in some signs
It may glow in the dark