WordReference Random House Unabridged Dictionary of American English © 2026
rhumb line′, 
  1. Nautical, Naval Termsa 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. Also called loxodrome, rhumb. 
  • 1660–70

Collins Concise English Dictionary © HarperCollins Publishers::
rhumb line n
  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
Often shortened to: rhumb Etymology: 16th Century: from Old Spanish rumbo, apparently from Middle Dutch ruum space, ship's hold, but also influenced by Latin rhombus
'rhumb line' also found in these entries (note: many are not synonyms or translations):

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