sal ammoniac
noun
: ammonium chloride
Word History
Etymology
Middle English sal armoniak, from Latin sal ammoniacus, literally, salt of Ammon
First Known Use
14th century, in the meaning defined above
Medical Definition
sal ammoniac
noun
sal am·mo·ni·ac ˌsal-ə-ˈmō-nē-ˌak 
: ammonium chloride