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Meaning of plumb rule | Babel Free

Noun CEFR B2

Definitions

A narrow board with a plumb line fastened to the top, used to determine a perpendicular.

CEFR level

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

plumb-bob Plumbable plumbage plumbagin Plumbago plumbane

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