nodal

from The Collaborative International Dictionary of English v.0.48

Nodal \Nod"al\, a.
   Of the nature of, or relating to, a node; as, a nodal point.
   [1913 Webster]

   {Nodal line}, {Nodal point}, in a vibrating plate or cord,
      that line or point which remains at rest while the other
      parts of the body are in a state of vibration.
      [1913 Webster]

from The Free On-line Dictionary of Computing (8 July 2008)

NODAL

   Interpreted language implemented on Norsk Data's NORD-10
   computers.  Used by CERN and DESY high energy physics labs to
   control their accelerator hardware, PADAC and SEDAC.  Included
   trackball input, graphics.