alums
a-lums
noun
Informal plural of alumnus or alumna, meaning former students of an institution.
"Many alums returned for the university celebration."
noun
Plural of alum, referring to various double sulphates, often potassium aluminium sulphate.
"The chemist ordered various alums for the experiment."
Thesaurus
Synonyms: grad, graduate, potassium alum, potash alum, ammonium alum, ammonia alum