alum

21 ENTRIES FOUND:

1al·um

noun \ˈa-ləm\

Definition of ALUM

1
:  a potassium aluminum sulfate KAl(SO4)2·12H2O or an ammonium aluminum sulfate NH4Al(SO4)2·12H2O used especially as an emetic and as an astringent and styptic
2
:  any of various double salts isomorphous with potassium aluminum sulfate

Origin of ALUM

Middle English, from Anglo-French alum, alun, from Latin alumen
First Known Use: 14th century

Other Chemical Engineering Terms

alkali, cation, decant, hygroscopic, isotope, oxidize, slurry, solute, viscous

2alum

noun \ə-ˈləm\

Definition of ALUM

Origin of ALUM

by shortening
First Known Use: 1910

Other Education Terms

baccalaureate, colloquium, corequisite, dissertation, monograph, pedant, practicum, survey course, thesis

3alum

abbreviation

Definition of ALUM

Other Chemical Engineering Terms

alkali, cation, decant, hygroscopic, isotope, oxidize, slurry, solute, viscous

al·um

noun \ˈal-əm\   (Medical Dictionary)

Medical Definition of ALUM

1
: either of two colorless or white crystalline double sulfates of aluminum used in medicine internally as emetics and locally as astringents and styptics: a : one KAl(SO4)2·12H2O that is a sulfate of aluminum and potassium—called also potassium alum b : one consisting of an ammonium aluminum sulfate NH4Al(SO4)2·12H2O—called also ammonia alum, ammonium alum
2
: any of various double salts isomorphous with potassium aluminum sulfate

alum

noun    (Concise Encyclopedia)

Inorganic compound, any of a class of hydrated double salts, usually consisting of aluminum sulfate, water of hydration (an essential part of the crystal makeup), and the sulfate of another element. The most important alums are those of potassium sulfate (potassium alum, or potash alum, KSOAl(SO)24HO), ammonium sulfate, and sodium sulfate. Alums occur naturally in various minerals and can be prepared and purified by crystallization from their solutions. Most are white crystals with an astringent, acid taste. They are used as paper-sizing agents, flocculating agents in water treatment, mordants in dyeing, and in pickles, baking powder, fire extinguishers, and medicines.

Browse

Next Word in the Dictionary: alumbloom
Previous Word in the Dictionary: alulet
All Words Near: alum

Seen & Heard

What made you want to look up alum? Please tell us where you read or heard it (including the quote, if possible).

Get Our Free Apps
Voice Search, Favorites,
Word of the Day, and More
Join Us on FB & Twitter
Get the Word of the Day and More