iron alum
/ˌʌɪən ˈaləm/noun
Chemistry. Each of two hydrated double sulphates of (ferric) iron and (respectively) potassium and ammonium, belonging to the series of alums and typically pale violet in colour.
- Formula: KFe(SO4)2·12H2O (with potassium); (NH4)Fe(SO4)2·12H2O (with ammonium)..
Origin
Mid 19th century. From iron + alum, perhaps after German Eisenalaun or French alun de fer.
- pyruvate oxidase
- pyruvic acid
- pyruvic aldehyde
- pyruvic kinase
- pyruvic oxidase
- pysanka
- pysanky
- Pytchley
- Pytchley coat
- Pytchley Hunt
- Pythagoras
- Pythagoras' theorem
- Pythagorean
- Pythagorean comma
- Pythagoreanise
- Pythagoreanism
- Pythagoreanize
- Pythagorean letter
- Pythagorean lyre
- Pythagorean number
- Pythagorean proposition
- Pythagorean system
- Pythagorean triple
- Pythagorean triplet
- Pythagoric