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isogonal line

noun
  1. an imaginary line, or one drawn on a map, connecting all points of equal magnetic declination.
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Also called isoganal, i·so·gone [ahy-suh-gohn] /ˈaɪ səˌgoʊn/, isogonic.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018