One of the mysteries of the English language finally explained.
Treated or caused to react with alum; containing alum.
Combined, alloyed, or caused to react with aluminium; coated with aluminium.
Mid 18th century; earliest use found in Nathan Bailey (d. 1742), lexicographer and schoolmaster. From classical Latin alūminātus containing alum (from alūmin-, alūmen + -ātus) + -ed; compare -ated<br>late 19th century; earliest use found in Items of Interest. From alumin- + -ated.
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