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Definition of Plumb line
1. Noun. A cord from which a metal weight is suspended pointing directly to the earth's center of gravity; used to determine the vertical from a given point.
Exact synonyms: Perpendicular
Generic synonyms: Cord
Specialized synonyms: Lead Line, Sounding Line, Plumb Rule
Terms within: Plumb, Plumb Bob, Plummet
Generic synonyms: Cord
Specialized synonyms: Lead Line, Sounding Line, Plumb Rule
Terms within: Plumb, Plumb Bob, Plummet