loxodrome

n.
See rhumb line.

[Greek loxos, slanting + Greek dromos, course.]

loxodromic lox'o·drom'ic (-drŏm'ĭk) or lox'o·drom'i·cal (-ĭ-kəl) adj.
loxodromically lox'o·drom'i·cal·ly adv.

[back-formation from loxodromic, from Gk. loxos, oblique + dromos, course]  /LAK suh drome/
a rhumb line, a curve that appears to be a straight line on a Mercator map

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The noun has one meaning:

Meaning #1: 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
  Synonyms: rhumb line, rhumb

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