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pelorus

[puh-lawr-uh s, -lohr-] /pəˈlɔr əs, -ˈloʊr-/
noun, plural peloruses. Navigation.
1.
a device for measuring in degrees the relative bearings of observed objects.
Also called dumb compass.
Origin of pelorus
1850-1855
1850-55; perhaps < Latin Pelōrus, now Faro in Sicily, a cape which requires skill in navigation
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Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for pelorus

pelorus

/pɪˈlɔːrəs/
noun (pl) -ruses
1.
a sighting device used in conjunction with a magnetic compass or a gyrocompass for measuring the relative bearings of observed points
Word Origin
of uncertain origin, perhaps from Latin Pelōrus a dangerous Sicilian promontory
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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