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