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lubber's line

noun, Navigation
1.
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
1855-1865
1855-65
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for lubber line

lubber line

noun
1.
a mark on a ship's compass that designates the fore-and-aft axis of the vessel Also called lubber's line
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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10
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