isogonicPronunciation: /ˌʌɪsə(ʊ)ˈgɒnɪk/Definition of isogonic adjective Geography indicating or connecting points of the earth’s surface at which the magnetic declination is the same. Origin: mid 19th century: from Greek isogōnios 'equiangular' + -icisogonic in other Oxford dictionaries Definition of isogonic in the US English dictionary
