alum : Idioms & Phrases

Index

alum root

Al"um root`
Definitions
  1. (Bot.) A North American herb (Heuchera Americana) of the Saxifrage family, whose root has astringent properties.
Webster 1913

alum schist

Al"um schist", Al"um shale" (Also<
  • Alum schist
  • Alum shale
)
Definitions
  1. (Min.) A variety of shale or clay slate, containing iron pyrites, the decomposition of which leads to the formation of alum, which often effloresces on the rock.
Webster 1913

alum stone

Al"um stone`
Definitions
  1. (Min.) A subsulphate of alumina and potash; alunite.
Webster 1913

ammonia alum

  • noun a white crystalline double sulfate of aluminum: the ammonium double sulfate of aluminum
    ammonia alum; alum.
WordNet

ammonium alum

  • noun a white crystalline double sulfate of aluminum: the ammonium double sulfate of aluminum
    ammonia alum; alum.
WordNet

Chrome alum

  • noun a violet-colored salt used in hide tanning and as a mordant in dyeing
WordNet
  • (Chem.), a dark violet substance, (SO4)3Cr2.K2SO4.24H2O, analogous to, and crystallizing like, common alum. It is regarded as a double sulphate of chromium and potassium.
Webster 1913

Feather alum

  • (Min.), a hydrous sulphate of alumina, resulting from volcanic action, and from the decomposition of iron pyrites; called also halotrichite. Ure.
Webster 1913

potash alum

  • noun a white crystalline double sulfate of aluminum: the potassium double sulfate of aluminum
    alum; potash alum.
WordNet

potassium alum

  • noun a white crystalline double sulfate of aluminum: the potassium double sulfate of aluminum
    alum; potash alum.
WordNet

roche alum

Roche" al`um
Definitions
  1. (Chem.) A kind of alum occuring in small fragments; -- so called from Rocca, in Syria, whence alum is said to have been obtained; -- also called rock alum.
Webster 1913

Rock alum

  • . Probably so called by confusion with F. roche a rock. Same as Roche alum.
Webster 1913

Roman alum

  • (Chem.), a cubical potassium alum formerly obtained in large quantities from Italian alunite, and highly valued by dyers on account of its freedom from iron.
Webster 1913

Soda alum

  • (Min.), a mineral consisting of the hydrous sulphate of alumina and soda.
Webster 1913