1. 
   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 op http://en.wikipedia.org/wiki/Isochron
   
   
2. 
   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 op http://www.wordinfo.info/words/index/info/view_unit/2781/6
   
   

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