alum
名词 alum:
a white crystalline double sulfate of aluminum: the ammonium double sulfate of aluminum
同义词:ammonia alum, ammonium alum
a white crystalline double sulfate of aluminum: the potassium double sulfate of aluminum
同义词:potassium alum, potash alum
a person who has received a degree from a school (high school or college or university)
同义词:alumnus, alumna, graduate, grad
a double sulphate of aluminum and potassium that is used as an astringent (among other things)