plumb line
American Heritage Dictionary:
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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.
Oxford Dictionary of the US Military:
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plumb line
A line with a plumb attached to it, used for finding the depth of water or determining the vertical on an upright surface.
See the Introduction, Abbreviations and Pronunciation for further details.
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A cord or line, having a metal bob or weight attached to one end, which indicates the true vertical direction.
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Copyrights:
American Heritage Dictionary
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
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Oxford Dictionary of the US Military
The Oxford Essential Dictionary of the U.S. Military. Copyright © 2001, 2002 by Oxford University Press, Inc. All rights reserved.
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McGraw-Hill Dictionary of Architecture & Construction
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc. All rights reserved.
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