alum rock
noun
A kind of rock which contains substantial amounts of alum, especially in the form of the mineral alunite; alum stone.
Origin
Mid 17th century.
- Army List
- army-navy
- Army Reserve
- army surplus
- army worm
- Arnel
- Arne, Thomas
- Arnhem
- Arnhem Land
- arnica
- Arno
- Arnold, Benedict
- Arnold, Matthew
- Arnold, Sir Malcolm
- Arnold Toynbee
- a road to nowhere
- aroha
- arohanui
- aroid
- aroid lily
- a Roland for an Oliver
- arolium
- arolla
- arolla pine
- a rolling stone gathers no moss