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Definition of plumbline

plumbline

/ˈplʌm.laɪn/
plumb · line
Plural:plumblines
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plumbline Lexical Profile

plumbline Game Scores & Validity

• noun

1

A cord with a heavy lead weight or plumb bob attached to one end, used in construction, carpentry, and navigation to determine whether a surface is truly vertical or to measure the depth of water.

Example

"The mason suspended a plumbline from the top of thebrickwork to ensure the new wall was perfectly vertical."

2

A criterion, standard, or principle used to test truth, rectitude, or accuracy.

Example

"Constitutional principles serve as the ethical plumbline by which the court measures new legislation."

Synonyms
View all synonyms for plumbline

• Rhymes for plumbline

• Nearby Words

plumbago
plumber
plumbing
plumbline
plumcake
plumcot
plume

Word Origin & Etymology

Formed as a compound of 'plumb', from Old French 'plomb' and Latin 'plumbum' (meaning lead, the metal traditionally used for the weight), and 'line', from Old English 'line' (cord or rope).

Cite this Entry

Wordmom. (2026). Definition of Plumbline. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/plumbline
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