Rhumb n.  Navigation A line which crosses successive meridians at a constant angle; -- called also rhumb line, and loxodromic curve. See Loxodromic.
  To sail on a rhumb, to sail continuously on one course, following a rhumb line.
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  rhumb line
       n : a line on a sphere that cuts all meridians at the same
           angle; the path taken by a ship or plane that maintains a
           constant compass direction [syn: rhumb, loxodrome]