Isogonic \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.
Source: Webster's Revised Unabridged Dictionary (1913)
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