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isogenic
isogenous
isogloss
isogon
isogonal
isogonal line
isogone
isogonic
isogonic line
isograft
isogram
isohel
isohyet
isolani
isolate
isolated
isolated pawn
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isogonic line
i·so·gon·ic line (plural i·so·gon·ic lines)


noun 
Definition:
 
line connecting points of same magnetism: a line on a map of the Earth's surface connecting points at which a compass would give the same deviation from true north
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