Also found in: Thesaurus, Encyclopedia, Wikipedia.
Related to Isogonic lines: aclinic line
|(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.|
See also: Isogonic
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.