aclinic line

noun
aclin·​ic line | \(ˈ)ā-¦kli-nik-\

Definition of aclinic line 

: an imaginary line on the earth's surface roughly parallel to the geographical equator and passing through those points where a magnetic needle if suspended freely has no dip or inclination and assumes a horizontal position

called also magnetic equator

— compare agonic line, isoclinic line

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History and Etymology for aclinic line

a- entry 2 + -clinic

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