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")