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alum (n.)
[alum 词源字典]
late 14c., "whitish mineral salt used as an astringent, dye, etc.," from Old French
alum
, from Latin
alumen
"alum," literally "bitter salt," cognate with Greek
aludoimos
"bitter" and perhaps with English
ale
.
[alum etymology, alum origin, 英语词源]