6 results for: plumb line

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Dictionary.com Unabridged (v 1.1) - Cite This Source - Share This

plumb line

–noun

1.	a cord with a lead bob attached to one end, used to determine perpendicularity, the depth of water, etc. Compare plumb (def. 1).

2.	plumb rule.

[Origin: 1530–40

]

Dictionary.com Unabridged (v 1.1)
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.

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Encyclopædia Britannica, Inc.
plumb line

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American Heritage Dictionary - Cite This Source - Share This

plumb line
n.

A line from which a weight is suspended to determine verticality or depth.
A line regarded as directed exactly toward the earth's center of gravity.

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The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2006 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.

WordNet - Cite This Source - Share This

plumb line
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

The American Heritage Science Dictionary - Cite This Source - Share This

plumb line Audio Help (plŭm) Pronunciation Key
A line regarded as directed exactly toward the Earth's center of gravity.

Webster's Revised Unabridged Dictionary - Cite This Source - Share This

Plumb line

Plumb\, n. [F. plomb, L. plumbum lead, a leaden ball or bullet; cf. Gr. ?, ?, ?. Cf. Plummet, Plunge.] A little mass or weight of lead, or the like, attached to a line, and used by builders, etc., to indicate a vertical direction; a plummet; a plumb bob. See Plumb line, below.

Plumb bob. See Bob, 4.

Plumb joint, in sheet-metal work, a lap joint, fastened by solder.

Plumb level. See under Level.

Plumb line. (a) The cord by which a plumb bob is suspended; a plummet. (b) A line directed to the center of gravity of the earth.

Plumb rule, a narrow board with a plumb line, used by builders and carpenters.

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