isochron

isochron 1. A line (imaginary or on a map) connecting points at which a particular event occurs or occurred at the same time. 2. A line (imaginary or on a map) connecting points on the sea-floor formed at the same time.
Found on http://www.wordinfo.info/words/index/info/view_unit/2781/6

Isochron

You may find such normal form transformations for relatively simple systems of ordinary differential equations, both deterministic and stochastic, via an interactive web site. ...
Found on http://en.wikipedia.org/wiki/Isochron
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