What does ammoniac or ammoniacal mean?
The definition of ammoniac and ammoniacal
Am*mo”ni*ac, Am`mo*ni”a*cal, a.
Of or pertaining to ammonia, or possessing its properties; as, an ammoniac salt; ammoniacal gas. Ammoniacal engine, an engine in which the vapor of ammonia is used as the motive force. — Sal ammoniac

Etym: [L. sal ammoniacus], the salt usually called chloride of ammonium, and formerly muriate of ammonia.