| Ammonia | a pungent gas compounded of nitrogen and hydrogen (NH3) |
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| Ammonia | a water solution of ammonia |
| Ammonia | a white crystalline double sulfate of aluminum: the ammonium double sulfate of aluminum |
| Ammonia | an atomic clock based on vibrational frequency of the nitrogen atom in the ammonia molecule |
| Ammonia | a water solution of ammonia |
| Ammonia | the aromatic gum of the ammoniac plant |
| Ammonia | pertaining to or containing or similar to ammonia |
| Ammonia | pertaining to or containing or similar to ammonia |
| Ammonia | treat with ammonia |
| Ammonia | combined or treated with ammonia |