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Alum Rock

suburban area

Old EnglishAI-generated

Alum Rock is named after the mineral alum, which was found in the area, and 'rock', referring to a prominent rock formation or outcrop. It denotes a rock containing alum.

Word origins

Alum
Old Englishalum (mineral)(from alūm "alum")
Rock
Old Englishrock, prominent rock formation(from rōc "rock")