硝酸钙 Traditional form: 硝酸鈣 Pinyin (reading): xiāosuāngài Definitions: calcium nitrate Characters: 硝 - saltpeter; to tan leather 酸 - tart, sour; spoiled; acid 钙 - calcium Traditional characters: 硝 - saltpeter; to tan leather 酸 - tart, sour; spoiled; acid 鈣 - calcium