noun
ammonium sulfide
Inorganic compound (NH₄)₂S; used in analytical chemistry and photography.
硫化アンモニウムは水溶液中で強いアルカリ性を示す。
Ammonium sulfide shows strong alkalinity in aqueous solution.
Compound of 硫化 (ryūka, 'sulfide') + アンモニウム (ammonium), a direct translation of the English chemical term.