isochrone
noun 2
Definitions
noun
1
An isoline on a map or chart connecting points that have the same value for some time-related variable.
isochrones of urban development, isochrones of equal travel time
Isopoll maps can be reinterpreted to show the migration of a particular genus or ecotone through time by isochrones (equal time lines).
2
A semicubical parabola.
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