Definitions

1. adjective

relating to or characteristic of ammonia or ammonium salts

“The ammoniacal smell emanated from the chemical laboratory.”

2. noun

a solution or compound containing ammonia or ammonium salts

“The chemist carefully handled the ammoniacal solution in the experiment.”

3. noun

an impure or ammoniacal state of the atmosphere, especially one that is unhealthy

“The doctor advised the patient to stay indoors due to the ammoniacal air quality.”