Roman alum

English

Noun

Roman alum (uncountable)

  1. A cubical potassium alum formerly obtained in large quantities from Italian alunite, and highly valued by dyers on account of its freedom from iron.

Part or all of this entry has been imported from the 1913 edition of Webster’s Dictionary, which is now free of copyright and hence in the public domain. The imported definitions may be significantly out of date, and any more recent senses may be completely missing.
(See the entry for Roman alum in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.)

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