a cord with a lead bob attached to one end, used to determine perpendicularity, the depth of water, etc.
Compare (def 1).
a string with a metal weight at one end that, when suspended, points directly towards the earth’s centre of gravity and so is used to determine verticality, the depth of water, etc
another name for plumb rule
plumb line
A line regarded as directed exactly toward the Earth’s center of gravity.


Read Also:

  • Plumbness

    [pluhm] /plʌm/ noun 1. a small mass of lead or other heavy material, as that suspended by a line and used to measure the depth of water or to ascertain a vertical line. Compare . adjective, Also, . 2. true according to a plumb line perpendicular. 3. Informal. downright or absolute. adverb, Also, . 4. […]

  • Plumbous

    [pluhm-buh s] /ˈplʌm bəs/ adjective, Chemistry. 1. containing bivalent lead. /ˈplʌmbəs/ adjective 1. of or containing lead in the divalent state adj. 1680s, “leaden;” 1854 in chemistry sense, “containing lead” (especially in a low valence), from Latin plumbosus “full of lead,” from plumbum (see plumb (n.)).

  • Plumb-rule

    noun 1. a device for determining perpendicularity, consisting of a narrow board with a plumb line and bob suspended from an upper edge. noun 1. a plumb line attached to a narrow board, used by builders, surveyors, etc

  • Plumbous-oxide

    noun, Chemistry. 1. .

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