Alum is the name generally given to two common salts: potassium aluminum phosphate and ammonium aluminum sulphate. A double sulfate of aluminum and of an alkaline earth element or ammonium; chemically, an alum is any one of the markedly astringent double salts formed by a combination of a sulfate of aluminum, iron, manganese, chromium, or gallium with a sulfate of lithium, sodium, potassium, ammonium, cesium, or rubidium; used locally as a styptic. Alumni: Graduates or former students of a particular educational institution; former members, employees, contributors, or the like. That’s because Latin grammar has a lot more distinctions based on gender than English grammar does. Nice, huh? Alumni is a plural noun referring either to a group male graduates or to a group of both male and female graduates. Sometimes alum is seen in its crystalline form, although it is most often sold as a powder. Now let’s get to the plurals. But there are many types of alum and it is important to get to know which alum to use, the correct dosage and also the correct method to use it to prevent any side effects. The Latin term for a former school is alma mater, meaning "nourishing mother"; therefore, an alumnus can be seen as the foster son (pupil) of the nourishing mother (the school). Often used openly by educational institutions. 12H 2 O are considered to be an alum. When to Use Alumni. Information and translations of Alum in the most comprehensive dictionary definitions resource on the web. Alum, any of a group of hydrated double salts, usually consisting of aluminum sulfate, water of hydration, and the sulfate of another element. Technically, alumni is the masculine plural form of the noun, but it can be used for either a group of mixed gender or a group of men. Alumnus definition is - a person who has attended or has graduated from a particular school, college, or university —usually used of a man in the singular but often of men and women in the plural. ‘Alumni’ and ‘Alumnae’ A group of male graduates are alumni and a group of female graduates are formally called alumnae. 12H 2 O.Other alums are named after the monovalent ion, such as sodium alum and ammonium alum. Alum (Fitkari) is an amazing ingredient with wonderful uses. In its naturally occurring state, the substance has been used for more than 2,000 years in a wide variety of applications. Meaning of Alum. ni A male graduate or former student of a school, college, or university. A made-up word that people use when they don't know the singularity of "alumnus" or plurality of "alumni." Definition of Alum in the Definitions.net dictionary. How to use alumnus in a sentence. Alumnus or Alumna? It has many wide uses from water purification to skin lightening. 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