Definition of agonic line in English:

agonic line

Syllabification: a·gon·ic line
Pronunciation: /əˈɡänik ˌlīn
 
/

noun

An imaginary line around the earth passing through both the north pole and the north magnetic pole, at any point on which a compass needle points to true north.
More example sentences
  • Navigators on these so-called agonic lines do not need to make the usual correction to their compasses.
  • Extended lines that mark the constant magnetic declination away from the agonic line are called isogonic lines.
  • When using a compass east of the agonic line, the needle points in a direction that is west of true north.

Origin

mid 19th century: from Greek agōnios, agōnos (from a- 'without' + gonia 'angle') + -ic.

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Pronunciation: əˈnämələs
adjective
deviating from what is standard, normal, or expected