ISOGONIC
- a line indicating the earth's magnetic field, also ISOGONAL, ISOGONE [n -S]
- having or pertaining to equal angles
- noting or pertaining to an isogonal line
- imaginary line, or one drawn on a map, connecting all points of equal magnetic declination
- isogone (a line on a map used to show characteristics of the earth's magnetic field) [n ISOGONICS]