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rhumb line

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noun
  1. a curve on the surface of a sphere that cuts all meridians at the same angle. It is the path taken by a vessel or aircraft that maintains a constant compass direction.
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Origin of rhumb line

First recorded in 1660–70
Also called loxodrome, rhumb.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for rhumb line

rhumb line

noun
  1. an imaginary line on the surface of a sphere, such as the earth, that intersects all meridians at the same angle
  2. the course navigated by a vessel or aircraft that maintains a uniform compass heading
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Often shortened to: rhumb

Word Origin

C16: from Old Spanish rumbo, apparently from Middle Dutch ruum space, ship's hold, but also influenced by Latin rhombus
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