Definition of isogonic in English:

isogonic

Syllabification: i·so·gon·ic
Pronunciation: /ˌīsəˈgänik
 
/
(also isogonal /īˈsägənl/)

adjective

Geography
  • Indicating or connecting points of the earth’s surface at which the magnetic declination is the same.
    More example sentences
    • 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.

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