alum
pronunciation
How to pronounce alum in British English:
UK [ˈæləm]
How to pronounce alum in American English:
US ['æləm]
-
- Noun:
- a white crystalline double sulfate of aluminum: the ammonium double sulfate of aluminum
- a white crystalline double sulfate of aluminum: the potassium double sulfate of aluminum
- a person who has received a degree from a school (high school or college or university)
- a double sulphate of aluminum and potassium that is used as an astringent (among other things)
Word Origin
- alum (n.)
- late 14c., "whitish mineral salt used as an astringent, dye, etc.," from Old French alum, from Latin alumen "alum," literally "bitter salt," cognate with Greek aludoimos "bitter" and perhaps with English ale.
Example
- 1. Colonna , can you make gold from alum ?
- 2. Lt 's a whole technique.to do it yourself , try potassium alum .