\I`so*gon"ic\, a. [Iso- + Gr. ? angle.]
Pertaining to, or noting, equal angles.
{Isogonic lines} (Magnetism), 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.

\I`so*gon"ic\, a. (Zo["o]l.)
Characterized by isogonism.