Dictionary![]() ![]() lub'ber's line"Navig. 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,lub'ber line".Also called lub'ber's mark", lub'ber's point". Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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