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lubber's line

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lubber's line

–noun Navigation.
a vertical line on the forward inner side of the bowl of a fixed compass, used as a reference mark indicating the heading of a vessel.
Also, lubber line.
Also called lubber's mark, lubber's point.


Origin:
1855–65
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
Cite This Source Link To lubber's line
lubber line also lub·ber's line   (lŭb'ərz)   
n.  A line or mark on a mariner's compass or cathode-ray indicator that represents the heading of a ship or aircraft.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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