Definition of "separatrix" []

• The boundary separating two modes of behaviour in a differential equation. (noun)
• The decimal point. (noun)

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• "The observed strong electric fields and currents inside the separatrix region can be important for a local energization of ions and electrons, particularly of ionospheric origin, as well as for magnetosphere-ionosphere coupling."
• "Strong electric fields exist inside the separatrix regions and the electric potential drop across the regions can be up to several kV."
• "My point is that the nature of the separatrix and that of the basins of attraction are somewhat separate issues."