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plum pudding
plum tomato
plumage
plumate
plumb
plumb bob
plumb in
plumb line
plumb rule
plumbago
plumbate
plumber
plumber’s helper
plumber’s snake
plumbic
plumbing
plumbism
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plumb rule

plumb rule (plural plumb rules)


noun 
Definition:
 
tool for determining verticality: a plumb attached to a board, used to check how vertical something is

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