rum i) Any of the 32 points of the compass, ii) the angle between two successive compass points, iii) (in full rhumb-line) a line cutting all meridians at the same angle, iv) the line followed by a ship sailing in a fixed direction.
1. a curve on a surface of a sphere, e.g. earth, which cuts all the meridians at a constant angle other than a right angle; the curve is also known as loxodrome; 2. any point of the compass other than a cardinal point