Isogonic /(?)/

I·so·gon·ic

Isogonic

a.
  1. Pertaining to, or noting, equal angles.

Phrases & Compounds
Isogonic lines
lines traced on the surface of the globe, or upon a chart, connecting places at which the deviation of the magnetic needle from the meridian or true north is the same.

Isogonic

a.
  1. Characterized by isogonism. (Zool.)