Alum, any of a group of hydrated double salts, usually consisting of aluminum sulfate, water of hydration, and the sulfate of another element. 12H 2 O are considered to be an alum. How to use alumnus in a sentence. Meaning of Alum. 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). 12H 2 O.Other alums are named after the monovalent ion, such as sodium alum and ammonium alum. Alumnus or Alumna? Alum (Fitkari) is an amazing ingredient with wonderful uses. Sometimes alum is seen in its crystalline form, although it is most often sold as a powder. ni A male graduate or former student of a school, college, or university. Alumni is a plural noun referring either to a group male graduates or to a group of both male and female graduates. ‘Alumni’ and ‘Alumnae’ A group of male graduates are alumni and a group of female graduates are formally called alumnae. 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. Information and translations of Alum in the most comprehensive dictionary definitions resource on the web. Nice, huh? A made-up word that people use when they don't know the singularity of "alumnus" or plurality of "alumni." In its naturally occurring state, the substance has been used for more than 2,000 years in a wide variety of applications. 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. 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. When to Use Alumni. 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. Now let’s get to the plurals. 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. It has many wide uses from water purification to skin lightening. Definition of Alum in the Definitions.net dictionary. Often used openly by educational institutions. Alum is the name generally given to two common salts: potassium aluminum phosphate and ammonium aluminum sulphate. Used for more than 2,000 years in a wide variety of applications made-up word that use... 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