Enter a clue or pattern or both:
The Clue
It's lighter than air (7 letter answer)
The Answer
AMMONIA
Tags
Notes
The answer AMMONIA is rarely seen, appearing only about once every 2100 puzzles.
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Definition
AMMONIA as a noun:
1. a pungent gas compounded of nitrogen and hydrogen (NH3)
2. (ammonia water, ammonia, ammonium hydroxide) = a water solution of ammonia