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isogyric
isogyric adj. 
/ˌaɪsəˈdʒaɪrɪk/
Brit. /ˌʌɪsə(ʊ)ˈdʒʌɪrɪk/
, /ˌʌɪsə(ʊ)ˈdʒʌɪrɪk/U.S. /ˌaɪsoʊˈdʒaɪrɪk/
, /ˌaɪsoʊˈdʒaɪrɪk//ˌaɪsəˈdʒaɪrɪk/Π
1902 C. R. Mann & R. A. Millikan tr. P. Drude Theory of Optics 354 The loci of those points of the field for which ϕ is constant are the curves of constant direction of polarization (isogyric curves).
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