isogonic

I`so*gon"ic, a. Etym: [Iso- + Gr. Defn: 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. (Zoöl.) Defn: Characterized by isogonism.

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