Learn how to say Rhumb correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word rhumb:
1 (also rhumb line) an imaginary line on the earth’s surface cutting all meridians at the same angle, used as the standard method of plotting a ship’s course on a chart.
2any of the 32 points of the compass.
late 16th century: from French rumb (earlier ryn (de vent) ‘point of the compass’), probably from Dutch ruim ‘space, room’. The spelling change was due to association with Latin rhombus (see rhombus)