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Meaning of rock butter | Babel Free

Noun CEFR B2

Definitions

Native alum mixed with clay and iron oxide, usually in soft masses of a yellowish-white colour, occurring in cavities and fissures in argillaceous slate.

uncountable

CEFR level

B2
Upper Intermediate
This word is part of the CEFR B2 vocabulary — upper intermediate level.
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See also

rock cake rock cam rock candy rock cavy rock chat Rock City

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