Definition of isogonic in English:

isogonic

(also isogonal)

Pronunciation /ˌīsəˈɡänik/ /ˌaɪsəˈɡɑnɪk/

adjective

Geography
  • Indicating or connecting points of the earth's surface at which the magnetic declination is the same.

    ‘By 1701 Edmond Halley had dashed these hopes, showing that in the western North Atlantic, for instance, the isogonic lines (of constant variation) run almost east-west and so are independent of longitude.’

Origin

Mid 19th century from Greek isogōnios ‘equiangular’+ -ic.

Pronunciation

isogonic

/ˌīsəˈɡänik/ /ˌaɪsəˈɡɑnɪk/