Webster's Revised Unabridged Dictionary · 1913

Isogonic

Isogonic , adjective

[Iso- + Greek gwni`a angle.]

Pertaining to, or noting, equal angles.
Collocations (1)
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.

Isogonic , adjective

(Zoology) Characterized by isogonism.