American Heritage® Dictionary of the English Language, Fourth Edition
- n. Any of various double sulfates of a trivalent metal such as aluminum, chromium, or iron and a univalent metal such as potassium or sodium, especially aluminum potassium sulfate, AlK(SO4)2·12H2O, widely used in industry as clarifiers, hardeners, and purifiers and medicinally as topical astringents and styptics.
- n. Informal An alumna or alumnus.
Century Dictionary and Cyclopedia
- n. The general name of a class of double sulphates formed by the union of aluminium, iron, chromium, or manganese sulphate with the sulphate of some other metal, commonly an alkaline metal or ammonium. Common or potash alum has the formula Al2(SO4)3 + K2SO4 + 24H2O. It is produced by mixing concentrated solutions of potassium sulphate and crude aluminium sulphate. The double salt at once crystallizes in octahedrons. Alum is soluble in water, has a sweetish-sour taste, reddens litmus, and is a powerful astringent. In medicine it is used internally as an astringent, externally as a styptic applied to severed blood-vessels. In the arts it is used as a mordant in dyeing, and extensively in other ways. When mixed in small amount with inferior grades of flour, it is said to whiten them in the process of bread-making, but its effect on the system is injurious.
- To steep in or impregnate with a solution of alum.
- v. transitive To steep in, or otherwise impregnate with, a solution of alum; to treat with alum.
- n. US A graduate of a university or other institution.
GNU Webster's 1913
- n. (Chem.) A double sulphate formed of aluminium and some other element (esp. an alkali metal) or of aluminium. It has twenty-four molecules of water of crystallization.
- v. To steep in, or otherwise impregnate with, a solution of alum; to treat with alum.
- n. a white crystalline double sulfate of aluminum: the ammonium double sulfate of aluminum
- n. a double sulphate of aluminum and potassium that is used as an astringent (among other things)
- n. a white crystalline double sulfate of aluminum: the potassium double sulfate of aluminum
- n. a person who has received a degree from a school (high school or college or university)
- From alumnus and alumna, by removal of the non-native, gender-specific endings. (Wiktionary)
- Middle English, from Old French, from Latin alūmen. (American Heritage® Dictionary of the English Language, Fourth Edition)
“The Lost alum is set to guest-star on How I Met Your Mother, a show rep tells TVGuide. com.”
“The former Merck executive and Fordham University alum is giving $1 million to build a new football locker room on the university's Rose Hill campus in the Bronx.”
“After a shortlived gig on the canned CW drama The Beautiful Life, the High School Musical alum is sliding back into his singing and dancing shoes to leap to “new heights” in the Tony-award winning musical.”
“Boiling the samples in alum made the blue color disappear, leaving behind only the yellow of the original green sample. 3”
“Tom, a Stanford alum, is no stranger to such awards.”
“Another Lost alum is set to appear in the CSI franchise: Entertainment Weekly reports Harold Perrineau is set to appear in an April episode of CSI: NY, as a death row inmate who finds himself in the middle of a prison riot, just as he drops a bombshell on Hill Harper’s character.”
“The most widely used coagulant is Aluminium sulphate, commonly known as alum; Iron salts”
“I have, I believe, at last succeeded in arranging the proper proportions, and in substituting, for the worse than useless crude alum, the alum ustum or burnt alum, which is not affected by moisture”
Practical Taxidermy A manual of instruction to the amateur in collecting, preserving, and setting up natural history specimens of all kinds. To which is added a chapter upon the pictorial arrangement of museums. With additional instructions in modelling and artistic taxidermy.
“Probably the alumen referred to by Pliny, as exuding from the earth, was sulphate of alumina, without potash or soda, a salt not easily crystallized, but as effective, in many cases more effective, in the operations of dyeing, as alum, which is attested by the preference given to this salt over alum for many purposes at the present day.”
“Both these substances, so different in their origin, contain all that constitutes alum, that is to say, alumina, sulphuric acid and potash.”
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