Isogriv definitions

isogriv

isogriv In cartography, a line on a map or chart drawn through all points on the earth’s surface that have equal grivation (grid variation).
Found on http://www.wordinfo.info/words/index/info/view_unit/2795/5

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isogriv

a line on a map or chart connecting points of uniform grid variation.
Found on https://www.infoplease.com/dictionary/isogriv

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