potash alum
noun
,
Chemistry
1.
alum
1
(def 1).
Origin
1830-40
Examples from the web for
potash alum
Alunite has long been used abroad as a source of
potash alum
, which, it resembles in chemical composition.
British Dictionary definitions for
potash alum
potash alum
noun
1.
the full name for
alum
(sense 1)