alum

1. A white crystalline double sulfate of aluminum: the ammonium double sulfate of aluminum (synset 114652485)
   hypernym:

   • al, aluminium, aluminum, atomic number 13 - a silvery ductile metallic element found primarily in bauxite
   • double salt - a solution of two simple salts that forms a single substance on crystallization
   synonym: ammonia alum, ammonium alum
2. A white crystalline double sulfate of aluminum: the potassium double sulfate of aluminum (synset 114652297)
   hypernym:

   • al, aluminium, aluminum, atomic number 13 - a silvery ductile metallic element found primarily in bauxite
   • double salt - a solution of two simple salts that forms a single substance on crystallization
   synonym: potash alum, potassium alum
3. A person who has received a degree from a school (high school or college or university) (synset 109805779)
   hypernym: bookman, scholar, scholarly person, student - a learned person (especially in the humanities); someone who by long study has gained mastery in one or more disciplines
   hyponym:

   • ivy leaguer - a student or graduate at an Ivy League school
   • old boy - a former male pupil of a school
   synonym: alumna, alumnus, grad, graduate
4. A double sulphate of aluminum and potassium that is used as an astringent (among other things) (synset 102703481)
   hypernym: astringent, astringent drug, styptic - a drug that causes contraction of body tissues and canals

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